The dems will definitely gain quite a few governor's seats in this scenario but I think the GOP would gain senate seats since I believe a Republican president wouldn't do anything politically suicidal unless they're a true believer like Cruz or Huckabee.
Define politically suicidal for a Republican. As we saw in 2010, political suicide for Barack Obama was becoming President. I honestly think that what we've seen in North Carolina the past four years is a good example of what a Republican trifecta would look like at the federal level. A rabid, wild-eyed, right-wing Congress with Jeb Bush vetoing his own party's bills to try and save face.
Passing a national RFRA, invading Iran, blanket repeal of ACA, privatizing social security, banning Common Core, passing SOPA etc. Really I think it would be hard for Democrats to gain senate seats even if the pubs did 1 or 2 things like that since their defending so many more seats than the GOP is.
