Not with Donald Trump with his Tea Party patriots movement who pretty much has just as much Mitt Romney had in electoral strength.
Senate and Prez numbers favors Dems.
I don't think Trump is a Tea Party Guy. He is basically running the Campaign Playbook from Ross Perot's 1992 Campaign with a couple exceptions. Anyway a campaign like Trump is run every 25 years and "The Tea Party" is dead and it was only popular with Baby Boomers anyway.
Of course a Republican will win another Presidential I mean eventually they will. Maybe 2024 or 2028.