N0m: Only a tiny percentage of the Yeshivish/Chasidish population switched to MO. Whereas there is a huge percentage of MO who now identify with the Yeshivish community. As I mentioned, in virtually every Yeshivish Shul, Yeshiva and minyanim you’ll find very many former MO people. You do not find a significant population of former Yeshivish/Chasidish in MO schools or shuls. (And if you want to consider the OTD rate, the MO OTD rate is more than 10 times higher proportionally than the Yeshivish/Chasidish OTD rate.)
As far as your point that many MO people openly violate Halacha but, you claim, that by Yeshivish/Chasidish some publicly adhere to the Mitzvos, but when in private don’t, there’s two pertienent points:
1. You have no basis to claim that there’s any statistically significant percentage who publicly are frum but when no one is looking aren’t.
2. It is far far better a person be publicly Mitzvah adherent, even if in private he isn’t, than for a person to simply disregard Mitzvos even in public and openly and shamelessly violate the Torah.