Firstly, look how USB 3 is doing, Intel still won't intergrate it on chipsets while AMD have had it for ages, but not in the chipset(or is it I can't remember anymore).
Intel still control the mass market, if they refuse to fully accept it then they have every capability to kill it, or make it pointless.
LIght Peak started out as silly speed fibre optic connector that would have been awesome but had a rumoured $40 cost per mobo, ie , fail.
So its removed the optics and still done something fairly useful, though with display port you have a fairly similar interface, considering with display port, 1.4 or something, you can daisychain 6 screens already, its a bit awesome in terms of bandwidth/connectivity.
Though you can see applications for THunderbolt and Intel can push it easily, at the moment its seemingly a bit pointless.
Just had to check and Anandtech suggests Display port 1.2 can do 17.5gbps(bi directional, not sure) while Thunderbolt can do 20gbps each way, using cables very similar to display port.
It feels like display port supports a lot of whats going on anyway but Intel have slapped a controller on it to merge signals from a whole host of things together.
Really don't know how useful it could be, having one rig with 6 monitors, 6 virtualised users/copies of windows running, 6 mice/keyboards and so loads of people at work or a internet cafe all sharing resources with very few cables involved due to daisychaining, bandwidth and compatibility.
We'll see, it could be useful but most home users I can't see any valid use at all. Okay, it could give you maybe very fast networking.
Hands down Thunderbolt smashes USB 3.0 to pieces in terms of speed, versatility and simplicity of having really any devices all connected by the same type of cables and the ability to reduce cabling by daisy chaining everything up but we're years away from that being useful and every device you buy/have supporting it.
As with so many things in computing being first is often better than being "best".
The one real advantage is Intel really are slowing USB 3.0 as much as possible by refusing to support it fully, it costs mobo makers extra to add usb 3.0 to a mobo, rather than being free.
If the market was intel mobo's all have usb 3.0 for free, and $5-10 extra for Thunderbolt, it would be dead, as is, $5-10 gets you a choice and one is clearly better than the other, though has nothing available for it.