I don't see this momentum flagging at all. The third-parties are on board with the new generation and the software sales and initial sales aren't discouraging. Over the next year and a half we'll begin to get our first real exclusives, they might not be games that you like, but I'm going to guess that you probably aren't normally a first adopter for Sony/Microsoft so it doesn't matter, you're not the target audience that drives the initial launch of these consoles, nor am I because I always wait at least a year. Other people are hyped for Destiny, Titanfall and Watchdogs. Moreover Infamous Second Son is going to be a legitimately fantastic game. There's always a core of people who don't like the idea that they're playing the non-best versions of the game (PC games are awkward to run at max settings which makes them 'worse' in a different way to this type of person). Everyone has faith that these consoles are going to take off, so buying one now is an investment to them.
We're going to see a softer transition with more cross-generation titles, but we've also got things like Twitch fueling desire in a new way. Within the next couple of years more developers will be fed up of trying to make the game run on 256mb of RAM, and they'll make the switch too and then the deal will be sealed.
I'm about 80-90% certain that both consoles will sell more units this coming December than they did last. Which means that we're talking 20 million combined sales by 2015. That will be getting too large for publishers to ignore