Will the progression within the next gen be less impressive as this gen?

[curl-6]

PS4 and X1 seem pretty easy to develop for, so I don't see them seeing the kind of improvement we saw with PS3 and 360.

Not sure about Wii U. I'd say it definitely has the potential to greatly improve, given how little it's been pushed so far, but there's always the risk that it may continue to be underutilized and never reach its full potential.