Not NOW, this many years later. For a LONG time, you paid a premium for anything with Firewire.
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For the same reason Firewire didn't take off. It wasn't a standard on PC's (Basically because no one wanted to pay Apple a license fee for it) but if it WAS, more peripheral makers would have put it into everything. The ONLY thing that saved Firewire was the connectivity to cameras and video recorders. Apple was smart in not charging those companies the fee. Since thunderbolt won't require the Apple tax, there's a better chance for mass adoption. I'm not talking about PCI cards with Thunderbolt either. It needs to be an included port on every PC just like USB, and THEN the prices will plummet. Until then, we will see small price drops, but it will remain a premium item, or "professional" items, geared towards music and video industries. It needs to be commonly available on a mass consumer market, and cater to the general public, not just the tech guys like us.
There's an interesting bit of history behind this. There really was no "Apple tax"... just the threat of one. The downfall of FW and the rise of USB 2 was not actually caused by royalties Apple charged for the FireWire technology.
Firewire was developed by Apple in 1986. Control of it was given to the IEEE during it's development and, eventually, other partners brought their own intellectual property to the emerging IEEE 1394 standard. Not the least of these was Sony who, in the end, contributed more than anyone else. When Jobs returned to Apple in late 1996, the company was cash-strapped. He went about trying to find ways to infuse the company with revenue. By 1998 Apple was about ready to roll out the first PowerMac G3s with built-in Firewire. Hewlett-Packard approached Apple looking to license the technology.
Jobs had been away from Apple during the latter stages of Firewire's development and still thought of it as Apple proprietary technology. The story goes that Jobs and others were discussing a "$1 per unit" license within earshot of HP's attorneys. HP went ballistic. HP approached Texas Instruments to intervene with Jobs. TI declined. They'd negotiated their own solid license with Apple early on and it was hardly in TI's interest to do any favors for HP. Now furious, HP approached Intel demanding a newer, faster bus that was not Firewire.
The truth was, Firewire licensing was controlled by the 1394 licensing consortium by that time. Within two months after the fateful "$1 per unit" conversation, Sony had met with Jobs and pointed out that the Firewire technology that Apple was putting into it's products contained IP from other consortium members including Sony. They suggested to Jobs that, if he didn't drop the ridiculous notion of a $1 royalty, Apple would soon be paying the consortium to license it's own technology. Steve evidently said that $1 was never actually discussed with HP and that the 1394 consortium should handle the licensing. By that time, though, it was too late to save the HP deal. Six months later USB 2.0 was announced and promoted heavily by both Intel (not a Firewire partner) and HP.
It's also interesting to note that Apple was the first company to include USB in their products. They replaced serial ports with USB 1.1 on the same Blue and White PowerMac G3 in which they introduced FireWire. People were furious that Apple would replace their beloved serial ports. They were thrilled that Firewire had finally replaced SCSI.
Thunderbolt, by the way, is an Intel technology and is a much more flexible bus than USB 3. I think we're already seeing broader adoption of it than Firewire. Thunderbolt was originally called "LightPeak" because it included an optical version in the spec. Intel has committed to delivering optical Thunderbolt "in 2012" that would deliver up to 100Gbps at distances more than ten times farther than the current version's 6 meter limit.
The optical version is certainly, at least for the short term, aimed at a "niche market". But things change. Back in the day, continuous tone color printing was a niche market that supported us selling Kodak dye sub printers for $25K. Today your great aunt Tilda can get similar quality output from her free Lexmark printer. The point being, it seems Intel is serious about promoting Thunderbolt so only time will tell how well it's adopted. Cabling should drop drastically in price by early next year as Intersil starts shipping their new TB silicon and Belkin and others get into the fray.