Some people (myself included) would rather the system become worthless than anyone's privacy being at risk.
I mean, you have to keep your savings somewhere, right? You need savings for when you retire. And no alternative offers 100% anonymity, so in that case you would risk your anonymity for the security of your savings, right?
I’m not saying cryptocurrency will comprise even a minor part of your retirement savings any time soon, but perhaps in 10/20/30 years?
The problem is that non-private cryptocurrencies are permanent records of financial activity. I would rather risk soundness now than privacy forever, especially when there are post-quantum paths forward and our current assumptions are reasonable.