You guys are living in a fantasy if you think the Fox-Men will be back in the mainline MCU.
Aside from the inconsequential writing, half of the OG and First Class casts were miscasts (Alexandra Shipp especially) and quite frankly they will not be missed. The only reason we'll be seeing the Foxverse anyway is because we knew Deadpool had to be incorporated into the MCU somehow and we're in the midst of this Multiverse saga. So aside from some fun little cameos, I wouldn't bank on seeing any of them for MCU X-Men and thank God for that.
Let's get some fresh faces, a darkskinned and talented actress for Ororo and some solid writing for MCU X-Men and go from there.