Certainly there is a case for Trevor, just as there is a case for Dak. There's also a case for going with Dalton, or with Gilbert, the "load up on defense and have a bus driver offense" case.
There's a case for tearing down the entire team and starting over, after all we've had no significant playoff success for well over 20 years, other than win/loss records, if you start over you'll not be any worse off, in regards to getting SB trophies. Whether you don't make the playoffs or make the playoffs and lose in the second round, you are still a losing football team, as in there's the SB winner and everybody else is a loser. Maybe an essentially whole new team can be more successful.
All of the above have risk. All of the above are uncertain. All of the above will tick off some Cowboys fans and excite other Cowboys fans.
Pick your poison...