Romney came to BYU as a walk-on because he wanted to play with his brother. And he's had the chance to play with and throw TD passes to his brother - even though he was 3rd string coming out of fall camp. I just don't think his situation has changed enough to warrant him deciding it's time to move on.
Hall needs to figure out his injury issues. I just don't see him going anywhere either. I can't think of a position that won't potentially result in his bell getting wrung - if he moves on I wouldn't be surprised if it's to leave football altogether. Only position I can think of that would be safe for someone prone to concussions is kicker.
I actually hope Hall sits out the rest of the season and really lets his head settle, and then comes back next year with more time since the concussion - if he comes back at all.