Actually, after "years" it would make senses to remaster SOME titles, but in a Bethesda timeframe, Skyrim was published in January this year.
BGS has two lines that are would be available for remastering, Fallout and Elder Scrolls.
FO, FO2, Tactics, ES, ES2, Redguard and Battlespire are actually too old to remaster. To move these titles up to present day standards would pretty much require a rewrite.
This pretty much leaves FO3, NV, ES3, ES4 and ES5 available for remastering. Of that group ES3 would make the most sense and if remasters would be released one at a time, it would make sense to launch the remasters in the same order the originals were launched. Basically, you could expect Skyrim to be the last to be remastered.
I don't think that BGS would launch remastered games one at a time but as a part of a collection. That is to say, we could expect to see a remastered Elder Scrolls collection (ES3, ES4 and ES5) and/or a Fallout collection (FO3 and NV). Additionally, it would be a bit much to expect them to ship a one or more games remastered for the XBox One and PlayStation 4 before they ship a game specifically designed for those platforms.
Note: I am not ruling out the possibility, but it is my opinion that seeing anything being remastered in the near future is very unlikely.
Now for the caveat:
I do not now, nor have I ever worked for Bethesda Softworks, Bethesda Game Studios or any ZeniMax Media organization. I have never worked for any organization that developed or published games. To the best of my knowledge I have never even met anyone who has worked anywhere in the gaming industry. So any pronouncements I make are no more valid than any other industry outsider's.