Intel is suffering the Blackberry effect. The moment Apple did launch the iPhone, Blackberry died instantly. One year after that, their market share dropped from almost 100% to near zero.
That is the same thing all over again. This time with Intel.
Intel is just agonizing its final demise as a brilliant company which created a revolution in the eighties and nineties and then died.
Apple have what percent of the laptop market?
That percentage has crept up very slowly over the last decade.
Intel still have the largest percentage of laptop cpu's, AMD's share is growing.
The M1 is an apple exclusive, no PC users will be using the M1 but Apple.
Intel and AMD will be no doubt working on similar architectures, if they're not, well too bad for them, but contingency plans are vital for fabs.
I dont see Intel going anywhere, any time soon, they still have a dominant marketshare over Apple and seeing as Apple will keep theirs to themselves, not much is really going to change with the exception of AMD getting more CPU's in laptops, like they have with desktops.
I could be wrong but it's a hard sell.

Intel/AMD x86 laptop CPU market share 2024| Statista
Intel processors made up to over ** percent of laptop central processing units (CPUs) test benchmark results in the fourth quarter of 2024, up from the higher share seen in previous quarters but lower compared to the first quarter of the same year.
