Today, you can get a tablet for under $50 and Google is (or has) split its search stuff into PC and mobile search and is actively optimizing stuff for mobile because mobile search is eating the world. I seriously doubt anyone expected mobile to take over like this when it was new tech.
In contrast, "net books" seem to have gone extinct. I think that was supposed to be The Next Big thing -- until tablets came out and began eating their lunch.
https://en.wikipedia.org/wiki/History_of_tablet_computers
Humorously:
"Mobile to overtake fixed Internet access by 2014" was the huge headline summarising the bold prediction from 2008 by Mary Meeker...
http://www.smartinsights.com/mobile-marketing/mobile-marketi...
I agree with the previous remarks - the tablet industry was pretty well established 5 years ago and hardly cutting edge tech - 10 years ago is definitely a better comparison at this point, with the crappy tablet devices Microsoft were pushing at much higher price points then.