It works for us. It may not for you.
All I can say is, run the numbers. It doesn't matter if you have ten kids or none - you still have to run the numbers.
Figure out what your actual costs for your actual room if you pay cash at whatever level of resort you normally stay at, then compare that to the cost of
DVC at whatever level of points will be necessary for the actual type of rooms in the actual seasons you expect to go.
For DW and I, we ended up comparing annual trips staying at a Courtyard room at Wilderness Lodge vs. a studio at VWL - in any season but July 4th and Christmas/New Years. In the end, DVC should save us quite a bit of money. We should break even after 7 years, and then enjoy substantial savings from there on.
But that's just us -- you'll have to figure it out for you!