Didn't read all the replies......But my basic thought is simply "buy where you want to stay."
Will VGF2 points be good at the original VGF? YES
Will VGF2 points be more expensive than Riviera? We don't know! Maybe! Probably!
I would not worry about re-sale. It's not like Riviera points can't be resold. Right now, Riviera re-sells at about 65-75% of direct price --- About the same as every resort.
So let's say Riviera actually does have long-term re-sale worse than other resorts, it will never be THAT MUCH worse. So let's say Riviera and GFV are both $201 per point. Let's say GFV better retails resale value -- So in 5 years, you can re-sell GFV at 75% of the direct price -- $151 per point. Losing only $50 per point. On 250 points, you lost $12,500 in value. Let's say RIV re-sale value stinks, you only get back 70% of the direct price -- So you only get back $141 per point -- So when you re-sell, you lost $15,000! Is that difference enough to really base your entire decision around?
So go with the resort you like the most. If it's Riviera, go with Riviera. If it's GFV, wait for GFVII, which should go on sale within the next few months. If you want to wait to see the GFVII pricing.... just take your time.