OTOH, perhaps 95% don't care either way. Setting a minimum turn-out is a way to kill all referendums. It's only a "good" idea when you're in power.
Most eligible voters are probably not personally affected and so didn't see a need vote. A quorum would make it effectively impossible to change anything.
The current system makes it possible for a very small portion of the population to change things for everyone. I'm not sure that's better.
Bring in Australian-style compulsory voting then.
In Australia there would be no public vote for this. It would just be some internal council decision.
If said "everyone" would care, they'd definitely show up at the booths. So the change is better indeed, benefiting those few who care.
If a small portion of people is in favor of a change and the rest is ambivalent, does that mean the change shouldn't happen?