Given that 15-20 years ago almost all laptops were x86/Windows, "decline" is pretty much the only direction the platform could go in. I don't expect either x86

Given that 15-20 years ago almost all laptops were x86/Windows, "decline" is pretty much the only direction the platform could go in. I don't expect either x86 or Windows to go away any time soon – in general I think x86 has been somewhat unfairly maligned, and for most applications (including laptops) it works pretty well and is even the best available choice. I would prefer to say "diversification" or "the existence of actual competition" rather than "decline", as that doesn't imply it's going away.