I think the best way to tie things together for a sequel trilogy would have been for Rey to somehow be related to Obi Wan, like a granddaughter, who is then kept secret and hidden. Thematically, it turns the series from being about Skywalkers to being about Skywalkers and Kenobis. There's the issue of where his child comes from, but with cloning technology and a partially mysterious life on Tattoine looking over Luke, there are a few approaches. A lot of people believed The Force Awakens was leading toward an Obi-Wan connection, and like a few have stated, it's still possible, especially if Kylo Ren was lying.
Past that, I thought Snoke was intended to be Plagueis, as well. With Plagueis creating the Skywalker line, and the intention being that Anakin had the most force potential (and his offspring would likewise have the same potential,) the whole series could wrap around with the concept that Anakin was created to be possessed or taken over, however to do so, it requires him to first be robed into the dark side. His loss and injuries at the hands of Obi-Wan significantly reduced his potential, so nothing further happened. Until Luke arrives.
But Luke doesn't turn, so there goes that as an option. But there is more Skywalker blood. Kylo Ren happens. He's dark, he's angry, but he's not dark enough. There's still some good there. The Force Awaken plays out, and Snoke brings him to him. Why? Dark force possession or something similar. Still works with Rey as a Kenobi, who finally could redeem a Skywalker, etc., etc. I think it would round things in the PT.