I don't think I said it dooms Bitcoin to obscurity. I think it will give other coin devs a fighting chance to beat Bitcoin at it own game.
Hmm. Maybe. Some other innovation may out-compete Bitcoin. In the same way that other networking protocols preceded TCP/IP.
However, with the VC forces massed behind Bitcoin, rather than other alternatives (none of which -- as yet -- seem to offer anything of value over Bitcoin), it would seem a rather unlikely outcome.
Regardless, this particular 'problem' won't be the fulcrum upon which this universe is toppled.