We don't exactly know if they're going to make them extremely common as of yet, so there's no need to jump the gun there. But it all depends, are these minions going to be incredibly powerful in Lords of Verminion? If the answer is yes, I believe the increase in drop rate it justified. As of now, they're not reasonable to farm. What's the drop rate, 5-10%? Not only do you have to deal with an abysmal drop rate, but you also have to put up with out rolling 3 other people. It's not hard to get, it's entirely reliant on RNG. Someone could run it 1 time and get it, another person can run it 1,000 times and never see it drop. What I'd like to see is the minion being an achievement reward, complete the dungeon 10-100 times and you get the achievement along with the minion. If it's reliant on RNG, I couldn't care less if the drop rate is increased.
