The problem is that the old school hold-up striker doesn't really have a place in the high level game anymore. Dike is a Championship striker through and through. He's too big to be able to effectively press, and you cannot play at the highest level these days without the ability to do that (unless you're Ronaldo, and even then, have you watched United lately???).
If we played two strikers, which I'm not opposed to doing, I'd want Reyna to be the second striker. He can hold the ball, he can press, he's the best creative player we have and might as well use that in the attacking third. But in a 3-5-2, I'm not finding room for Pulisic or Weah. And maybe that's ok, but a little weird feeling. tbh, I'd love to see what a Reyna/Weah two man strike force looks like, Weah is direct as hell and very physical, if someone could feed him the ball into the box he could do more with it than anyone else in the pool.
But there probably isn't going to be enough time to work on wildly new set-ups.