I see this alot, but unfortunately MMR resets won't do anything besides cause chaos until everything ends up exactly where it is now.
MMR isn't some magical math holding you back, it's a ladder. If you beat players above you, you climb up the ladder stealing some MMR from them. Reseting MMR won't make the players above you any easier to kill, it will just squish everyone and make it so the first few months are "hope I got the guy who was immortal+ on my team this match". It would be radiants, immortals, bronze, irons, etc. all on the same team, and the good players would just stomp their way to the top, waiting for the lower ranks to fill out.
We also do soft MMR resets each episode, so if you really believe you are hardstuck next Episode would be the perfect time to prove that. But like other posts I've written, the system looks at not only winning but performance(diamond and under). It looks at every interaction with enemies you have, every assist you help get, and the MMR of all players involved. If you are truly better then people in your lobby, but lose the match, you can increase your performance MMR(but decrease your win MMR) and still open yourself up to climb. This is also why pros fly through low ranks fast, and even tho smurfs are a hot topic, why it's hard to maintain a smurf in low ranks unless you are purposefully throwing to do so.
Hope that explains a little bit why we won't probably ever reset MMR. Right now the conversation is how do we reduce the reasons players want to smurf, how to identify smurfs, and how do we handle smurfs when we identify them. That being said, even if the entire playerbase over plat smurfed, they wouldn't even be able to fill every single match in gold that occurs. So while smurfing is currently a topic the ranked team is focused on, our intial investigations make us think it may be slightly blown up in how often it's occurring. It's always hard to determine if a player that's popping off is actually a smurf, or just having a good game.