I think Elko doesn't have to worry about his QBs like Sark does at this time. It's his first year and he didn't recruit any of them. He doesn't have a vested interest in them other than picking one that he feels will be his QB for the next couple of years. The rest can transfer.
I think Elko made the switch because he doesn't have the confidence in Weigman that Sark has in Ewers. Is Weigman considered an NFL QB? Ewers may or may not be but he has shown he has potential to be a good, solid QB.
Is Manning really ready to take over? Sure, he looked good against creampuff U but did you see him throw passes in the Georgia game? His best play was a scramble. Put Manning and Reed in now and they will make mistakes any first year starter would make. Granted Manning has a little more experience but does he really give us the best chance to win. I can't answer that. I'll trust Sark to decide.
I blame the OL and Ewers for the offensive woes. It's not all on Ewers though the QB gets the blame. Just my 2 cents.