Manning still would get a shot. In analyzing the current landscape he has two options, go to a team that wants him, or wait for an injury (Tony Romo).
Manning is such a preparer I doubt he would choose the later.
Assuming Manning comes back he really has 2 good options and they were the teams that had the biggest QB issues last year: Cleveland & Houston.
If Manning objectively looks at both, there's no way in hell he doesn't choose Houston if given the option. Houston has the potential to have a dominant defense, in addition Houston has an indoor stadium.