I think that if Felipe hasn't regained any form by the end of the Monaco, he should hand his resignation to Montezemolo himself. I am assuming that the team will have improved the car a few tenths to where it's at least at the head of the midfield.
Unfortunately it seems that Felipe is not the same pilot since his accident. I know the doctors have cleared him, but maybe there's some underlying depth perception issue, or a confidence issue. Or maybe it's just the thought of his family & death in the back of his mind. But I think it's pretty clear he isn't the same. I read an article in Jan where his doctor said this year he should be fully back 100% no doubts.
I like Felipe, I wish him well. I wish that the team improves the car & him & Fernando fight for top positions. But I fear it won't happen. And if he doesn't improve, like I said he should retire. It would be a disgrace for him to go to anything other than a top team. I personally think if he left this season for good, he wouldn't lose any respect. But if he goes to a smaller team and struggles, he ruins what many think of him.