Re: Another Apple-backed standard that likely (hopefully) won't get traction...
I think you're missing the point. I haven't seen a graphics adapter, audio interface, video capture device, hard drive, etc that used DisplayPort as their input.
Thunderbolt allows for having a graphics card external to the computer. My guess is you have a desktop the size of a computer from 20 years ago that has a bunch of PCI ports. Good for you. Most of us real computer users have adopted laptops. But for people like me who game (or in a previous life did a lot of CAD and 3D design work) an external video card is very important for when our laptops are sitting on our desk. In fact, we could even see a line of displays that included a PCI slot to install a 3D card directly into the monitor. Since laptops either don't have a discrete 3D card or the mobile discrete cards in general aren't very powerful this is a huge plus for anyone that doesn't have a giant old style box with tons of expansion slots.
Regarding licensing, I cannot argue. I've been waiting for the ViDock to come out to add a 3D card to my wafer thin laptop. Problem is (according to Village Instruments) Intel won't let small developers develop for the standard. And another barrier to entry I understand is at least currently Mac OS X doesn't support 3D graphics cards over Thunderbolt (all though there is no reason they couldn't fix their software issues in their OS to support this.)
So the point is Thunderbolt can do a lot more than DisplayPort. But it would be much better if the licensing were more open. And its uses are going to be for new products going forward (like embedded graphics cards in monitors, A/V capture products, docking stations, etc.) not just external hard drives. Hell, I have Thunderbolt and USB 3 on my Mac and guess what 3TB external hard drive I just bought? USB 3.0.
You can bet when LightPeak finally matures (i.e. to the point of being all fiber optic like Intel originally demonstrated) Apple already has a design of the MagSafe power connector that combines the power and data into a single plug so finally laptop users only have to connect a single cable when they put their laptop on their desk. Currently even if you have a Thunderbolt display you still have to connect two cables to give you wired gigabit ethernet, USB, FireWire, Audio in and out, Thunderbolt chaining ports plus power.