I can see loading up on more BWV. It's a great resort, and the prices are economical!
Your family is young, but 2042 is another 17 years, which gets your youngest to 23 and oldest to 28. On one hand, if you are all Disney'd out by then, no harm, no foul. You'll have had a great run of vacations and points you can easily rent out on any off years where the kids' schedules or interest don't mesh with going. It might be nice to be done with dues before retirement is looming. My only drawback to BWV is the 2B only comes as a lockoff. I know they make sense when traveling with grandparents or adult couple children, etc., but with three school-aged kids, I want them under one roof with me on vacation. IDK if that's a thing for you, just throwing it out there.
The other thing is IF you like Riviera, their studios are gorgeous for squeezing in the five of you for another couple of years, and that Sorcerer AP IS a cost savings X5. We just stayed at PIT studio (sleeps only 4,) and they're laid out really well, but the
point chart is brutal, even for a standard view. Doesn't sound like Poly is your vibe anyway, and at $235?pp, that's too much to not be in love. Riviera's point chart looks like SAP+ to me now compared to PIT! (We also don't do studios. This was a couple-only trip for V-Day.)
While you're at Riviera in June, pop over to the cabins and check on the progress of LSL. While FW is totally not my scene, the cabins are really nice! I'd be nervous to buy there without confirmation of it being bundled into LSL, I DO think it'll probably happen, and the press leak yesterday of the super pools and lazy river they're adding to LSL makes it very appealing. I'm glad we have direct points to eventually swap in over there to try it out. Buying a fixed week there for Halloween and ditching your camper sounds ideal to me if you end up liking it. They're doing tours for existing members between 12:30-1:30 at Poly and CFW, and I'm assuming RR.
If you dislike Riviera but really like the CFW/FW area/LSL potential, maybe wait another year to pounce on any good incentives over there? You have points to use now to try out the OG14 to tide you over until then.
Basically, I'd wait until you get to stay at Riviera in June before you do anything. We own Riviera and love it, the Skyliner, calm lobby, quiet grounds, and wonderful transportation -- including our buses! We have our own dedicated buses, and my mind was blown when I discovered VGF and Poly SHARE buses. ***?!? (I also was VERY impressed at the bus service at AKK/AKJ, but that's a sideline.) Basically, don't fear the Skyliner lines. They're constantly moving, and the shutdowns for weather have barely affected us in eight trips, four of which were peak hurricane season.