This is an interesting point. Disney will probably need to stretch out new WDW DVCs until the original resort contracts begin to expire. Assuming a roughly 3 year selling cycle per project, after this WL project wraps up sales in 2020 they would really only need about 7 or 8 more projects to get to 2042. Off the top of my head here's 7 possible DVC projects that have either been rumored in the past or just make sense to me:
There are probably others we haven't even heard of yet. If each of these projects took roughly 3 years to sell it would stretch all the way until 2042. This also doesn't include any additional off property DVC projects. The other factor is that WDW is actually experiencing some growth recently. The last earnings release had hotel occupancy at 89% which is pretty healthy for recent history. They could also potentially add a 5th gate by 2042 resulting in additional attendance. It may be time soon that WDW considers expanding its hotel offerings (non-DVC rooms). It's very likely that if they do they will build a new resort as a mix of DVC and hotel rooms. Why try to jam it in later. If they actually go forward with either the River Country project or the EPCOT parking lot project I could see those being a mix use project with some studio hotel rooms, some cash room family suites (those are popular these days) and some DVC.
- Conversion of BWI rooms to DVC (maybe the whole resort)
- Conversion of additional BC rooms to DVC
- Conversion of some YC rooms to DVC
- Conversion of several "islands" of CBR into a DVC tower
- BLT2 on the site of the other garden wing
- EPCOT DVC in the parking lot
- River Country DVC project
Another possibility is that with something like 5 to 10 years to go on the original contracts Disney might offer extensions to existing owners. With the money from selling the extensions they could do some major refurbs on the existing resort and pocket the rest of the cash. When the contracts for any of those people who didn't extend expire the points can be resold creating a glut of DVC points to sell. With all of that available inventory they won't need to build anything new for a decade or more. In other words they could potentially start this reselling process in 2032 instead of 2042 meaning they really might only need 4 additional new projects after WL.
As one of those owners whose contract for most of my points ends in the original 2042 date, not the now 50 years from purchase, I would like to see an extension offer.