Like I have noted in other threads, I wouldn't get too hung up on the Riviera resale restrictions
unless you think you may actually put it on the resale market in the next 10 years. Riviera having resale restrictions isn't some unique characteristic of Riviera itself, it's Disney's new direction for
DVC (for now at least, I am holding out hope they wise up) which means any new resorts are going to have the same restriction, including any reissue of existing resorts when they start hitting contract expiration. It is going to take a long time for all of them to be on that same restriction playing field, obviously, but we are going to start seeing new resorts or expansions to existing resorts with those restrictions. Right now Riviera is at a disadvantage for it, but it won't be alone for long.
Also if you look at actual resale values, RIV hasn't been hurt badly so far by the restriction. It may be a little different right now, but I did a comparison of 130-160 point contracts at BLT, RIV, AKV, SSR, and BLT and RIV were trading about equal (150-155/pt) on that level contract. AKV and SSR were trading around $120-130/pt. And those were contracts with either pending sales or already sold. So it seems despite the worrying here, the restrictions haven't so far shown significant impact on the resale values. That could change, of course, but I would have a hard time letting it influence your decision right now.
All that said, I am on board with others that say Riviera has high point costs for rooms. We started off looking at 175 point contracts, and then decided to not feel pinned down or having to go every three years (which going every three years really hurts your ability to get as good a value on DVC it seems), we went up to a 200 point contract. Even then I see the possibility of buying another 50 points or so if the kid's first stay there goes really well and it does become a once a year thing to go.
If I could only get 150 points, I will be the first to say I would have a hard time doing that at RIV. There are some good points calculators out there, for smartphone or online. Put in some dates you plan to travel and length of stay and room type, and see what is required for points. If you only intend to go every other year, and your stays keep coming out in the 230-270 point range, then you are golden and 150 points should be fine assuming no significant changes to point requirements for that travel window. If it keeps coming out at 290-340, well, that is tougher. If you have to keep borrowing ahead, eventually becoming an every 3 year trip, then we are back to being in a tough spot to make DVC valuable.