I think that other laptop and desktop manufactures will bring their own ARM-bases offers in a 2-3 years. Intel is not yet doomed, but this will be a harsh blow for them.
I doubt that. CPU design and manufacture is a huge investment. I don't think laptop/destop manufacturers are going to put their money in it. And without a performant ARM CPU supply (Apply doesn't show any sign of releasing M1 for general use), there's just no ARM-based offers.