WWE can barely book those shows in a remotely entertaining manner and they're paid professionals.
Their only well booked show is an internet show infront of 200 people a week. I don't see it being too hard, really. Just put significance on the brand split once again, then use Superstars, Main Event and Saturday morning slam to put further emphasis on the lower-midcard as well as offering the opportunity to see interbrand matches and then focus NXT completely on the NXT roster, just like FCW, with the occasional appearance from main roster members.
Edit: Oh, actually writing full shows? Well to get to one PPV you'd be writing atleast 24 shows. Obviously it can be done, but I doubt anybody would want to. A fair few people find writing two shows a pain in the arse, I don't even want to think about writing six.