With scanning electron microscopes so cheap, materials science is moving very quickly lately, e.g. Nanocrystalline cellulose (NCC). I think that makes it that much harder to predict disruptive products, which not uncommonly include a convergence of new(ish) technologies. (<a href="http://www.newscientist.com/article/mg21528786.100-why-wood-pulp-is-worlds-new-wonder-material.html" rel="nofollow">http://www.newscientist.com/article/mg21528786.100-why-wood-...</a> )<p>But that said, form factor seems to be the most unresolved issue.<p>Each newly popular size (Samsung Tab, iPad mini, etc.) between the original iPhone and iPad sizes is hailed in some corners as changing the way users look at their devices ("I've stopped using my ___ because this new form factor does everything I want"-style comments).<p>It seems to me that "highly portable" and "can use with a keyboard" are two camps that seem will never converge...but IF they could, it would very disruptive to other form factors.<p>A folding tablet with available keyboard could be one possibility to converge those two form factors (which I posted about on HN quite awhile back at <a href="http://news.ycombinator.com/item?id=3422295" rel="nofollow">http://news.ycombinator.com/item?id=3422295</a>).<p>But since the next disruption may rely on convergence between technologies that aren't yet with us, who knows? And even things that look great (video phones and flying cars famously having been around for a loooong time) who knows if it will be something like Google Glasses or not? Hard to predict what will be adopted, and what it will be competing with to get users to adopt it.