I'm having trouble deciding! Should I abandon United Miles and its credit card because UA abandoned JFK for its West Coast flights? If so, which of the other miles programs with AA, DL, VX, or JB is a worthwhile replacement?

I've been pretty UA loyal for the past 10 years. My husband and I earn enough miles to for a vacation flight every year or two, and that's been a HUGE perk. We recently went on a trip to Croatia with points. We each still have 50k UA miles.

I get my points mostly by flying SFO>JFK RT on UA at least 6 times a year, plus another 4-5 RT flights (the routes and airlines for those flights vary) and miles from using my credit card. He flies about half that often. It's enough for a decent pot of miles each year, not for any status. We don't often use the free checked bag. We don't stay in hotels much.

Staying with UA for my West to East Coast flights and flying into EWR is definitely not an option since my destination is on Long Island. That means I'm not likely to fly UA much anymore.

It looks like keeping my UA credit card (with the annual fee) isn't worth it. I'm thinking of dropping the card once my husband and I get back up to 60k miles (enough for one last Europe trip).

Meanwhile, I think I need to pick a new preferred airline for my SFO>JFK flights and join their program. (Using flyertalk to research the others, but appreciate tips!).

Am I missing any reasons to keep the UA credit card and stay UA loyal?