The results from the poll are all 60/40 distributed, which means that combined would make at least 80% of the people play more if the mode is improved with all suggested options. However most people don't believe such thing will happen and consider the CRifts a missed opportunity. Maybe we will learn more at Blizzcon about that, let's see what info the invited streamers bring to us.
I doubt 80% would play more considering the only thing that had more than 50% saying they would play more is "more rewards". All the other changes probably wouldn't motivate 20% additional players over the 60% you'd get just by upping the rewards. I suspect there is a strong correlation among No votes and among yes votes on the other conditions.
Personally, I'm completely unsurprised that CRs weren't very popular and was predicting they wouldn't be successful the moment they were announced. The heart and soul of an ARPG is finding loot, and CRs take away the whole loot find aspect. The notion that people play ARPGs for competition seems kind of weird to me, when I compete, I'd much rather play a MOBA or shooter or something head to head. If they want competition, they should put in a PvP mode, not challenge rifts.