Not at all. When Crawford tells us that his audience believes that the psionic die mechanic is too much, all you have to support that those same people would greenlight the warlock today is pure faith. The current player base is clearly not interested in anything that works on a different base or with its own mechanics.
But - and now I must confess that I’m entering a purely speculative territory - I don’t believe that statement describes the player base really. I believe the D&D stronger base is still composed mainly of people excited about a warlock, or even a warlord or psion (even if they cannot agree about how they should work). Xanathar’s strong sales seem to support that belief. By this point, people giving consistent feedback on UA material could be a vocal minority.
I know that I, at least, am usually too busy preparing and running my two weekly games to spend the time on their surveys, unless I really love/hate what they bring. Whatever time I have for that, I prefer to be here on EnWorld or with the Brazilian D&D community on Twitter, even if doesn’t have the same impact.