I am proably in the minority but I don't think that the officiating was that bad this year. They had more good games than bad games. Unfortunately, the bad ones always get more pub than the good ones, but that is the nature of the beast.
Full time officials is just not a feasable option, because there are just not enough games to work. Being on the field in game situations is the one of the most important ways that an official can get better. They already go to training camp for a couple weeks with teams, not to mention 2 or 3 clinics in the offseason. What else would you like to see them do? Football season runs from August (training camp) to early january. What are they supposed to do in the other 7 months of the year, sit in a class room and watch film?? How do you do that when your workforce is spread out across the country??? It's not like any other sport where there's a ton of games to work each week
The NFL started NFL Europe and they have a vested interest in the arena league, I don't think they'll shell out too much more money to start up another league just so they can have full time officials. Besides, they are already using both of these leagues as training grounds for their younger officials, with some of the current NFL referee's doing a "tour" in europe. If you have your current officials working in those leagues, where are you going to get your "new blood" from???
One thing that I would like to see is the NFL develop a clininc where the fans see the game through the eyes of the official, so that they can understand what each official's responsibility is on the field.