I would probably give up as a fan if they brought in Trubisky. He's bad bad & if there was any circumstance where he was brought in to back up Baker (or anyone else) the fans would be clamoring for him from day 1 because "he gets us", "moxy" or some other bullshit line our fans regurgitate.
One name I would have a little interest, if its a 1 year stop gap, is Daniel Jones. He's looked like shit, but there is probably something there in this offense. If not, you are setup for a high draft pick.
I personally would like to bring back Baker because alternatives likely cost money & I dont want to spend assets or even pay Baker to not play here. If he sucks, same as above; & if he returns to some sort of good QB play, we are back in it. Unfortunately, it looks to be beyond repair.