1. The offseason can end up being very short. Short as in 3 weeks from signing the labor agreement to opening day. That makes very little time to get players in and going. This is likely a large factor in changing catchers and pitchers. The less turnover you have to deal with getting ready for a condensed season the likely better off you are.
2. Megill likely would only bring back a Cameron Crow type. He will only have about $7-8 million in excess value which is a 40+ grade prospect. Not something that will change much of anything.
3. The short time frame makes moving on from Contreras next year also difficult since the currently signed catchers are not viable (Naylor) or ready (Quero, Dinges). This also might mean Sanchez might be brought back.
4. The Brewers will hopefully be done paying Woodruff to not pitch freeing up a bit of money.
5. Given the short turn around I also don't see other larger trades getting done. I could be wrong but I feel teams will be scrambling to get FA deals done in a very short period of time that trades may languish.