It isn't so easy to 'bin' players on contracts as many seem to imply. The example of Moore last year indicates it might be more difficult to move on GK's than any other position (as there are such limited squad slots for them).
Unfortunately, Collins isn't what we thought he was when buying him. I am loathe to judge players off 1 season, but he looked like a WW1 'Tommy' with shell-shock last few months of the season.
Wilson was brought in to back up and push the first choice (Marosi, then Moore) and to be fair dislodged both of those. Neither will be starting (I hope), so Wilson is better in the role we have for him if you look back.
My prediction is all 3 will stay past this deadline, we should try to get Bell & Tyler out on loan for 6 moths/year to get some senior experience (even if it is National league) to aid development and make a better decision on them going forward.