Opinions are different, i get that. And also i know its an MMO but they already implemented the help of NPCs. Its just an idea to improve whats already there.
And there's still content you cannot do with NPCs and if you like playing with randoms in dungeons you can still do that as well.
For me it would slow down the way people run dungeons and i would be happy about it.
And with some classes i just dont feel secure enough to run dungeons with randoms... besides queue time