I think William will meet his younger self when he gets to the door and somehow his mind will be stuck in the body.
The park has the most information on who has been there the longest and William has played the game more than anyone else. they would have enough info to create a duplicate version of him like they tried to do with Delos.
The reason why this is a planned suicide mission is because he knows ford has copied him and he doesn’t want to be immortal anymore like he originally did. This is why when he talks to jim the final time he says men aren’t meant to live forever. This was recent we find out because Jim Delos is still alive when Bernard finds him and he looks nearly identical to how he currently looks.
It’s also a red herring when he called himself “death” in the shoot out scene with Lawrence’s wife.
Also there is a scene shown in the season trailer that shows William putting a gun to his head
We have yet to see this scene.
And then this:
“If you are looking forward, you are looking in the wrong direction."
That’s because he’s not going to meet death he’s going to meet another life.
The baby in the intro is just symbolism for his rebirth that he’s attempting to stop from happening due to his guilt over his wife’s death.
Just a guess.
He will be able to play the game forever but with his consciousness stuck in the body.