No it's not. That's just another reduction missing the point.
If the dollar was to be replaced, a new currency would be issued, there would be a period of trade-in for old currency, all systems of governance, regulation, etc would recognize it and issues could be handled.
Gold would still be used for everything from electronics to satellite coating to who-knows-what.
In the case of Bitcoin it would just disappear. You're arguing it's hard to replace because of its participants, which may be true, but is far less likely than the participants in the dollar.
Some businesses dependent on it and a lot of individual participants would lose their value in their wallets, and that's it. Believing in Bitcoin is betting on that being enough to prop it up. Gamble accordingly.
You gamble your property tax won't jump 50% or that police will stop rioters from stealing from it. I admit it is a much smaller gamble than bitcoin but it is still a gamble.
Holding your savings in $ is a bigger gamble than buying a house and some would argue it is a bigger gamble than holding bitcoin.
The degrees are what separates milk from butter, or a paper box from a house. That is the entire point. If you ignore the degrees to which something is different from another, then sure, everything is everything else.
> Holding your savings in $ is a bigger gamble than buying a house and some would argue it is a bigger gamble than holding bitcoin.
Perhaps, I'm not one of them. Time will tell.
So if you create another cryptocurrency which could use the same ASICS as bitcoin and you convince a lot of miners to switch then maybe.. it could be replaced but that is a tall ask.