I've already been lucky enough to get FTTC, and my connection varies between 50/5 and 20/2, I'd say. Other than some improvement in my upload speeds, I'm pretty much happy with the bandwidth. Why would I need more? I have an uncapped connection, but if I had 500Mbps I rather doubt my ISP would be willing to offer THAT uncapped... if I could even find anything that big (legally) to download on a regular basis.
This just seems like a big PR thing BT are doing so they can tell simpletons like David Cameron that "the UK now has super-mega-ultra-uber fast broadband". I'm with the rest of ya; finish the FTTC rollout, get that too ~100% of the population.
FTTC should be enough for anyone.