They're really there so bars aren't absolutely terrible. They also, imo, make games more interesting; with no wildcards, you can often get a situation where there's practically no viable defense in the deck whatsover, which leads to games being 2-minute slugfests where either team wipes pretty much instantly. With wildcards, offense gets stronger, true, but defense more so. Again, this is just my opinion, but it leads to longer, more interesting games where you can actually keep things alive for a decent amount of time.
Naturally, if the majority would rather play without wildcards, then we should play without wildcards!
Perhaps a more diplomatic idea would be, since I personally usually expect around 3 games on a Sealed Deck night, to play the first one without wildcards, then one with wildcards, so we actually try both ways before condemning one. With the time-limit to build, and the relatively early start time, I wouldn't be surprised to play 4 or 5 games on that night, so there should be plenty of room to experiment.