I think Epcot fans will love being able to buy an "Epcot Resort" that doesn't expire in 20 years, especially if they put some good restaurants and a high end pool in place. I also think the location relative to SW:GE will also be a selling point for some people. But will it have the popularity of VGF and Poly? I don't think so.
This is me. We love staying at BCV and because it's so hard to get in there (my 7 month window is today for February and availability for BCV was gone two days ago for our week), we were going to buy points just to be able to guarantee a split stay. I couldn't care any less about Star Wars, I very likely will stay far, far away from HS once it opens. But I would love a chance to be so close to Epcot. It's our absolute favorite park. If Riviera is even half as beautiful as Poly, I'll be purchasing there.
Edit: Also, I don't know if Poly has the same popularity as BCV or VGF... Right now, my entire stay is available for Poly, both Standard and Lakeview. And there's no days at all for BCV.