Hilton's technically expire although I don't know how diligent they are with deactivating accounts. No idea on Wyndham or Carlson.

With most programs, any activity will extend them. With HH it's easy: get the Amex or Visa if you live in a location where one or the other is offered. Do the others have credit cards associated with them?

(I'm assuming this question is meaningful because you don't intend to have the most common activity - a stay or redemption - anytime soon.)

All three of those programs also have a few transfer in and out opportunities. I'll bump a few Carlson points over to US Airways as soon as the fall Grand Slam starts.