The thing with poker is that the ability to gain extra info on your opponent often translates directly into your winrate vs that opponent. Given this idea, it follows that everyone is gonna do everything possible to achieve said info.
What banning huds would do is reset the information 'quest' 3-5 years. But it won't stop this tendency of trying to force an edge over your opponent
PT and HEM would simply add features to export whichever stats you like into the Poker client's notes. It won't update in real time, but you'll have stats.
It probably doesn't matter all that much.
It's not that having a HUD in itself gives you that big an advantage right away. I bet that many people adjust incorrectly or too quick to overadjust because they use a HUD. They might actually be better off without it.
Stats (at the sample sizes you obtain through normal play) are not the end all be all.
I like having a HUD but I think I've grown more indifferent towards having it since I've learned that players that might have similar VPIP and PFR are still individuals with individual tendencies.