If a poster thinks Evers has hit his ceiling and can't improve after this year, then you are entitled to your opinion. If he doesn't work at it, then you are right. Otherwise, I would recommend holding judgement until August or even later because (a) he can improve his footwork (b) he can learn the offense better (c) he can learn to read defenses better and (d) he can be healthy to start the season and not have broken toes and concussions.
The pining for Welliver is understood as the most popular player on a football team is the backup. The above sans the injury applies to him as well. If a Fagnano type does come through the door, he still has to learn the offense and develop chemistry with the rest of the offense. Lots of catching up there.
Finally, let's see who the new passing coordinator/QB coach is to get the full picture.