Aviation is cyclical and nobody can tell what the future holds, certainly not in 20 years. Is Delta a much safer bet right now? Absolutely. Does going to Delta today ensure you won’t be on the street in 1, 5, or 20 years? Absolutely not.
If you can live anywhere and happily move to a DL base, why not try? But if you do it, don’t look back, because once you start 2nd guessing decisions, you’ll never be happy no matter where you are.
FWIW I decided to stay, because I love my job, my base, and driving to work. If we go completely tango uniform and we’re all out on the street (unlikely), then I’ll make it work, same as any other furloughed pilot in history.