There already is the passport card and border crossing card for use in North America. Something like this might happen sooner between the US and visa waiver countries in Europe and parts of Asia, but I think it'll take a much longer time than you think for the "few remaining countries" (more like most remaining countries) to go off the paper system.

So I think paper booklets aren't endangered in the next couple decades, although they might get smaller and smaller (but with the Schengen states starting to stamp a hell of a lot more often a couple years ago, this is going to require paper real estate so long as it lasts).

I'm with puddinhead though ... I don't have a RFID passport yet, but my pre-chip passport will expire soon. As soon as the new one arrives, I plan to nuke its chip.