As noted by Andrew Marchand of the New York Post, that spot could go to Drew Brees.
Brees, technically employed by NBC but (as Marchand reported on Sunday) not expected to return, wants to call games. There are no games for him to call at NBC. Fox, meanwhile, has an obvious opening.
“If Brees wants to have a big NFL broadcasting career, this is probably going to be his best — maybe last — chance to do it,” Marchand tweeted. “Fox will not break the bank for him, but the opportunity will be there.”
The simple reality is that most seats are filled. One remains open, at least until Olsen gets bumped back down to No. 2 by Brady. But that at least gives Brees a year or two or maybe even more (depending on how long Brady keeps playing) to hone his craft and position himself for whatever the broadcasting reality will be once Brady shows up.