I think a large number of DVC members are empty nesters. The ones that aren't will be eventually.
We are now. We bought 20 years ago when our girls were young. We now just use our membership in different ways.
that is just like us. we bought in 1999, and would go every august, in a 1bdrm. kids were about 10 and 13.
now, DD is 29 (yikes!), and the two of us go every april/may (F&GF), 10-13 days in a BWV studio. its a great "girls only" vaca
then, DH & i go every oct, about 10-12 days in a BWV studio for the F&WF. we meet up with friends, have dinner, play mini-golf, etc.
totally different vacations than when the kids were, well...kids
now, we relax, read, lay by the pool, do what we want/when we want, don't worry about riding or seeing anything (since we've done just about everything at least once).
as much fun as WDW was when the kids were little, i think we can honestly say that these vacations are much more relaxing. we come home feeling like most ppl would feel after spending a week at the beach, etc - the big difference is that we didn't get bored. there are still many other activities at WDW if we do decide to do them
ETA:
the main thing i wish we had done differently would have been to add our kids to the deeds at purchase. it is easier - and cheaper -to do it initially rather than later on.