In more realistic terms while the current situation of computing hardware companies dumping the consumer markets to chase AI profits is stupidly horrendous and damaging in the short term (several years), I dont think the consumer hardware will remain in a vacuum.

Smaller companies will try to step into the space left behind by the big companies that left it behind. But it'll take time and their product will probably be inferior compared to what we're used to getting because all the talent and money will go to serving the AI market.

So we're going to be in a bad place - but computers won't be entirely gone, they'll just suck.