It might be a minority, but its a sizeable one, and a lot of those who choose to sit want to have the atmosphere a kop can provide, I'm sure of it. Those who want to sit, can, and those who want to stand, can't - and perhaps tipping that ratio a bit wouldn't be a bad idea, otherwise the majority...
If I follow your argument correctly, you sit because you have to sit, whereas you used to stand, so if safe-standing was introduced you'd stand again. So whats the problem?