We bought the number of points we thought we could afford and figure out what we can do based on that number. Our trips are usually 6 nights, but we have done 5, 7 and 10 as well.
I hate to move and so we do not move unless we are spending part of the vacation at the beach or Universal/Sea World. I do not see that pattern changing.
If necessary (we do have a small point buffer), we'll either stay a day or two less, stay in a studio instead of a 1 bedroom or even occasionally skip a trip.