This is a chicken-and-egg issue. If you had plenty of men stepping up to be deacons (or anything else), then there would likely be fewer women simply because there would be fewer open positions for them to take.
It’s not that a couple of women show up and suddenly men see a “pink-collar ghetto” and flee in droves. If that was the case, we would have few male doctors, few male lawyers, few male engineers, because some women started to enter all those professions. According to the reasoning of some on this thread, men would go, “ugh, medicine/ law/ engineering has become feminized, I don’t think I’ll enter that field” and go do something else.
If men are truly worried about seeing too many women being lectors and EMHCs and cantors and altar girls, and worried that deacons and priests will be next, then the correct response would be to step up and become a deacon or a priest or serve in some capacity. Amazingly, at many of our parishes this is actually happening and we see lots of men serving as well as going to Mass. I haven’t heard any of the K of C members, male ushers, lectors, or servers saying, “There’s too many women on this altar, I’m going to drop out.”
Last Sunday I noticed that the Mass I was at was being served by two altar girls, which was a bit unusual. Then I noticed after Mass while I was going to confession and doing Holy Hour that the two girls were the two oldest siblings of a large Catholic family (also going to confession and staying for Holy Hour) that included three younger boys who seem very likely to become servers themselves once they reach the age to do so. Given that their father was sitting there with them praying, confessing and guiding them through Holy Hour, I can’t see those little boys suddenly saying “ugh, altar serving is for girls”.
But, y’know, if it makes men feel better to blame women for their own lack of motivation, it’s not like that hasn’t been happening since Adam started the trend. Have fun with that.