Trends are important to consumers and to hackers (I'm one of both), that's the purpose of the question and a huge one that matters.
If your question was "should I bother developing for large-screen devices" (which IMO is less important than "developing for high-DPI devices", but that's a different issue) then just ask.
IIRC metrics on screen size (and more importantly, DPI) are available, but I have no idea where.