They have a Nike/Coke kind of grip on the market. But that kind of stuff can flip on a dime if Apple begins to be 'not cool'. They have survived releasing bad products(butterfly keyboards and bad antennas). They survived from being the cool thing young adults use and migrated over to the phone your mom uses.
I really can't see any obstacles for their domination of the Veblen good tech market. And that market is incredibly profitable, where Asus has significantly tighter margins.
I'll probably end up buying some total market ETF since even 100k in a good performing Apple is only ~7-15% per year, 7k-15k... but the risk is insane. Even when I bought Google after the Bard PR flop, I still only made a 10% return in 2 months, and I probably had heart palpitations doing it.