There's one more thing. MCU's Phase One was around the Infinity Saga; well, I believe the current Phase will be around the Secret War. And if you ask me which version of the Secret War, I think the most obvious choice would be the 2015's version. Pretty much at the end of it, we could have a MCU that has "assimilated" characters and elements from the Sony's movies; just like the 2015's Secret War allowed main Earth-616 to assimilate characters from different realities.
Between them, Earth-616 "assimilated":
- Miles Morales (the Ultimate Spider-Man) from the Ultimate Universe.
- Several secondary characters from the Ultimate Universe, like the Bombshell girl, I think.
- The Old Man Wolverine.
- The "humaniod galaxy girl" from the A-Force's territory.
- Some elements from the 2099's future (I think).
You get the idea.
EDIT: By the way, I think both Tobey and Andrew's Spider-Men could be permanently moved into the MCU. Why? Well, the idea of three different Peter Parkers/Spider-Man in the same universe is nor really weird. I mean, in a way, it would be like an adaptation of the comics' Clone Saga, as the three Peters could interact as brothers in a similar way to how Peter does with Kaine and Ben.