Ther are some (few) technical sets that are officialy "extendable" with the official powerfunction set, the one with a M-motor, battery box, lamp but not much more.
I think that there would be nice to have a second official version of powerfunction set, a version with the servo motor and maybe one more motor and the remote control.
On the market side, that is the most important thing for lego, this would make customers buy the more advanced powerfunction when they realise they missed out on advanced functions on there new set.
But for me, I want more sets properly motorized by lego with instructions, but I undetstand that they think include motors make the sets too expensive.
What do you think?