Personally I'd ignore all of the things Apple said before.
I can 100% see this happening.
2 points:
1: As we know, touch designed based iOS apps are going to run naively on new ARM Mac's in the future.
2: Take a child you was given an iPad at a young age, from the age of, let's say 3, 4, 5 they will be using touch for everything. their entire computing world will be touch, and simply accept screens accept touch input.
A few years on, and you give them a Macbook, the 1st thing they will do it touch the screen as they have been doing all their lives and simply expect it to work.
Sure Apple said NO, but then they said no Stylus/Pencil, they said no BIG screen phones.
They only say no, when they don't want to sell it NOW.
It's all leading to be touch enabled when the price is right and they decide now is the time.
Personally I think it's unthinkable to say Apple will NEVER allow touch screens.