The consumer only sees one thing.
USB - Easy to use. Many periphreals. Cheap price point.
Thunderbolt - Does same thing, costs more and not back wards compatible UNLESS they buy a hub/adapter(which currently doesn't exist).
TB doesn't do the same thing. That has been the huge
fail with the initial marketing kool-aid trying to position TB as the "one port to rule them all and replacement for everthing including USB".
The consumers only see TB as doing the same thing now because folks keep perpetrating that delusion even as Intel has now backed far away from it.
Also, has any PC vendors other than Apple implemented/adopted the Thunderbolt port?
"... Acer ... a magnesium-aluminum alloy cover (in Onyx Black), HDMI / USB 3.0 / Thunderbolt (!) ports and an SSD for good measure ..."
http://www.engadget.com/2012/01/08/acer-aspire-a5-ultrabook-announced-ces-2012/
"...Gigabtye ... They both also offer a GeForce GT 640M GPU with 2GB of memory, up to a 750GB hard drive as well as USB 3.0, Bluetooth 4.0 and Thunderbolt connections. .. "
http://www.engadget.com/2012/03/05/gigabyte-unveils-u2442-ultrabooks-and-p2542g-gaming-laptop/
"... Lenovo ... it packs Dolby Home Theatre sound, optional NVIDIA Optimus graphics, up to 1TB in storage and Thunderbolt (!), making this the first Windows PC to make use of that standard. ..."
http://www.engadget.com/2012/01/05/lenovo-announces-seven-laptops-for-small-businesses/
In part the larger flood of boxes have been waiting on the new, non version 1.0 implementation of the controllers, that Intel is going to roll out this Spring. But the designs have been dribbling out in preview shows for those who have bothered to look.
This is extremely similar to the "USB 3.0 is doomed" talk that happened 1.5-2 years ago as vendors waited for the early adopters to take the initial version of the controllers and "work out the kinks and bugs" because adopting in larger numbers.
USB 3.0 is now well on its way to being mainstream. TB is aimed a big higher priced device grouping but it too with take a couple of years to fully get its share of design wins and deployments. In the real world, people just don't wave they hands and new products pop onto the market in a couple of weeks. At least not quality products.
Just because it's faster and more efficient doesn't mean it will survive.
USB is trenched in consumer minds & easy to use.
If it uses that "faster" to provide services USB cannot then it will. The point is not faster to a single HDD/SSD disk or any other single function connectivity.
Blu-ray has higher throughput & capacity but I don't see consumers running to get BD burners because DVD is cheap & does the job.
That is more so driven by the higher costs of Blu-Ray disks at this point. The Blu-ray players have dropped into the same price zone where DVDs got high traction. Even BD burners are getting close to the sweet spot now.
Blu-ray adoption rates are very similar to what DVD adoptions rates were. Most of the "doom and gloom" about Blu-Ray is from FUD campaigns from alternative distribution advocates. Besides, I have yet to see a Blu-Ray player that doesn't play DVDs. Blu-Ray is to DVDs as USB 3.0 is to USB 2.0. You've recycled the spin argument into the wrong thread.
That aside, again this is just repetition of the flawed argument that USB 3.0 and TB are the "same thing". They don't overlap anywhere near as much as DVD and Blu-ray do.
Why would a consumer want to switch to a more expensive port that does the same thing from their POV.
It is only more expensive if you primarily assign it to a single task. As an industry standard docking port slot is better than the proprietary stuff that is out there now.
Given the overall large personal computer shift to laptops, it is long past the point that there should be a standard docking port connector. That is essentially what is going to be what Intel pushes through with TB.
There are secondary usages that folks will leverage it for but given that foundation it is
extremely low danger of it disappearing. Primarily because there are no creditable competitors for that function. Nor are there for several other (but not ubiquitous) extremely low latency interconnect contexts. USB 3.0 is capable enough to make a large number of usages for FW disappear but not all. A combination of TB and USB 3.0 can blunt much of what some others ( FW , eSATA , etc. ) provide.
IMO, Thunderbolt may survive as a niche if there is enough adoption to generate a modest margin off it's products unless Apple & Intel eat some cost & encourage manufacturers to make products at a price comparable to USB.
The primary fallacy is that all of the devices have to be price comparable. They don't have to be.
The only huge threat to TB is that it doesn't move out of this status where Intel is the only implementer. One of the perceived lingering threats of TB is that there is some patent/licensing troll that will jump up later and suck margin out of TB devices. Over time that is dissipating but with one and only one implementer that seems to be a very real potential threat to some.