As to what that value will be, I have no fucking idea. I don't imagine that it will be a major currency. But it'll always have some use cases, imo.
I mean your argument is essentially like saying: TCP/IP is just a protocol and anybody can switch to a different protocol any time. Well, sure. But they haven't. And they won't unless it breaks completely.
You can point to TCP/IP, but we've seen other protocols come and go. Back in the late 90/early 2000s's AOL messenger was dominate. Now nobody uses it. And that had very strong network effects, it was a messenger system.
That statement demonstrates you don't understand cyptocurrency at all. You're absolutely wrong, the difference between them is security, and that's something people value. And no, you can't trivially just substitute another crypto in place of bitcoin, other cryptos have neither the liquidity nor the security (which comes from the size of the network) to effectively move around the amount of money bitcoin can move around.
> I don't think the networking effects are that strong for bitcoin
Which means flatly you don't understand how cryptos work; no one who does would make that statement.
Bitcoin has nobody forcing you into using it and nobody controls the price. Bitcoins are just bits on a ledger that maybe someone will buy from you tomorrow, maybe.
Even in the niche roles where bitcoin is superior to bank accounts, credit cards, and cash, there is nothing beyond momentum keeping people from switching to another type of cyptocurrency. That's why it's monopoly money.