Realistically I don't think I'll have time to even use two consoles next gen, hence why I plan to just pick one this time around. Unless Microsoft pulls a Nintendo I will almost certainly be going with them.
That's where I am.
The 360 is moving to where I wanted the next box to be anyway, being my STB and gaming box. I mentioned this a long time ago in the Predict the Next Generation thread that I was really hoping Live would evolve into a full entertainment hub. I'm happy to see that has been accelerated and coming this gen. Nextgen I completely expect the ability to have it be my DVR/Gaming/DVD/BR/Streaming/Cloud services device. I just built a PC for gaming so between the two and having limited time, I'm set.
I'll keep the PS3 if the 360 replacement doesn't come with BR otherwise, I'll just get rid of it.
At this point, I'm not sure what the Wii or PS4 would need to provide for me to have any interest in them.