Will ryder be in the next game as the main character.

I hope so. The ME universe works well as a Trilogy format. DA suited a change in protagonist every game because the stories are vastly different and in each one the "big bad" was defeated then onto a branching story in the same universe. ME on the other hand is a longer arc spanning multiple games. In the original trilogy we had the Reapers and much like the Remnant there was only really a hint of that in the first game. I'd like future games to follow that arc to conclusion, and it wouldn't make sense to do that with an entirely new team every time. Shep and co were strong because they learned and grew in each game. Ryder and co should do the same.