Given the increase in population of the Frum communities vs the decrease of R/C, I expect to see the R/C/MO congregations being assimilated into the Sephardim. The Sephardim are orthodox but have the attitude of allowing their congregations practice as they see fit. We see this in Israel. Especially among the Mizrahi.
We are expecting to see changes in attitudes among Jews worldwide as the Mizrahim in Israel come to dominate the culture.