The Jets simply do not have many options. I don't think bringing in another Qb makes all that much sense unless it is part of a trade, since hte logic is that if Simms and McElroy do not have it in either of them to play, why did the Jets have them on the roster all along? It makes no sense. (Not to digress but i suppose they could say those two guys, or at least one of them, has not shown enough to deserve a roster spot, but the irony here is that neither has had all that much of a chance to show their stuff, even in practices. Simms having some success against third stringers does not change that, either.)
But I agree that the start Geno now idea could cause more problems for him than he would benefit from playing. When people say experience helps development, they mean good experience, not the experience of failing. Geno's performance against the Giants was a failure. He needs more time learning how to mix knowing what they are tryhing to do with MM's playbook and what the D is doing.
Btw, assessing McElroy's abilities based on the sacks he took last season is problematic. That was arguably the OL's worst game all year. Was it something more than coincidental it happened with McElroy in there? More than likely, but it is not clear to me that is the explanation. RIght now I would expect him to play better than Smith, and better than anyone else they can bring in who has been named. (I assume Foles is not available.)