The same miners holding up BTC are holding up BCH and BSV,
you may believe them when they say they only support one coin.
But hey , you're kind-of-really stupid.

compare their respective hash rates. miners obviously believe in BTC much more than those altcoins.
Nothing about bitcoin is sustainable, exponential energy waste, new asics needed every 2 years, no guarantee that price covers cost, competitors with cheaper fees and faster performance with just as good security.
"just as good security"---no, not with regard to attack cost.
why should there be any
guarantee that price covers cost? is that true for gold miners or any other commodity producers? of course not, because that's not how free markets work.