Just a general thought. At some point (for consumers anyway), these paradigms will unite. As such, what will follow is the necessity for window management that can handle different use cases. Right now the only OS really attempting to bridge the gap is Windows 8, which is currently an unfortunate juxtaposition of two battling WM's rather than a seamless unification. Apple isn't really bothering to unify at the moment…
I sometimes get the impression most people now think of window management as either a solved problem and/or one rendered irrelevant by the rise of "mobile", but it's quite the opposite IMO.