There has been talk of the droneships refueling the landed stages and then them taking off and flying back to the LZ.
It's sounds crazy to me, but so did a rocket launching, splitting in half, then landing 1/2 on a barge in the ocean to be reused while the other half goes to a GTO orbit.
Once Falcon Heavy is flying you could upgrade those flights to FH with a flight profile where you can land all cores on land. The only difference would be more fuel used (which is cheap) and threefold increased risk of stuff going wrong in the first two minutes. May depend on how important it is to get those cores back immediately. Upgrading otherwise expendable flights to FH is already planned as well.
The upgrades of Block 5 later this year will improve reusability and performance, though, so more missions can be RTLS.
