That potential "scaling chain" would have to battle the 20k+ shitcoins first before it gets to the throne. I wouldn't worry about it that much. Even in the misleading "bitcoin dominance" terms all thousands shitcoins combined are valued less than half of the total "crypto market cap". Any shitcoin is simply bitcoin's counterfeit inflation which we can easily detect and dismiss. The only effect of it is a temporary drop of bitcoin's purchase power which lets other people stack harder.