I think Wilson is probably the most reasonable expectation unless Thompson looks better here than he did starting in New York. I just didn't see any reason to get excited about him as a backup during the preseason. He was kept IMO because he is a good special-teammer.
Of course, we also do have the option of moving Heath back to free safety (his better position), and starting Frazier at strong safety. Would strengthen the SS position against the run, but weaken it against the pass.
The coaches like Thompson (As a Safety).
His coverage was good in the preseason and he was in the correct location at the correct time against the run.
His issue was missed tackles. He tends to come in too hot (too fast) when attempting to make tackles.
He did play more conservatively when he was the last line of defense. It was generally tackles up in the outside area within about 10 yards of the line of scrimmage where most of his missed tackles occurred.
It is too bad that Frazier is not a little better against the pass because he is good against the run at SS.
I do recall Frazier making some mistakes in pass coverage during the preseason games. One mistake resulted in an easy TD for the opponent.