The long run does not translate to a unit life span. This is clearly a long transition, so until a standard is dominant, accommodate what the current market majory uses. It is too early to force in this case TB and eliminate FW, Ethernet, etc. In my case it would take a replacement of several g-raids at about $1800 per pop, and that's just the beginning. Someone at apple is obviously both drunk and stupid.
I agree, and the adoption of it will take as long as it takes. Well, and then there will be something else, newer, faster, better, more expensive...
I don't think Apple is drunk, or stupid. I think they are thinking of something that could, eventually, kill USB, and provide, so far, an ultimate in flexibility and expansion options. If Apple killed USB, FireWire in its two flavors, and forced people to use Thunderbolt or nothing, I'd get in the car and go there and ask them what they hell they are smoking.
I think that Ethernet is pretty much here to stay. Coming up with something different would be like getting people to breath water instead of air. And USB will always be around too, at least for my lifetime. FireWire, I'm not convinced. High pricing of Thunderbolt devices could kink its adoption, however with its capabilities, it could end up, for a while, like Fibre Channel is now: for the 'big boys'. It will come down, it will get to be as ubiquitous as USB is now. It will take time to get the prices down and for the licensees to figure out who they want to sell to.
On an aside, historically, Apple has gone with interesting choices for interfaces and expansion. I remember the Nubus slots in the Mac II's. Someone still uses that bus technology I believe. Nope, it's pretty much dead. Being 32-bit only though...