MO as philosophy/movement is certainly alive and well but has not enjoyed the same increase as the yeshivishe and Chasidishe communities. For those looking for hard numbers all you need to look at is the numbers from the day school census from 1998-2013. The MO students pretty much stayed flat but the chareidi numbers increased by an incredible amount. over 2/3 of day school students are in Chareidi schools (Satmar alone has 10%)
Limud hatorah has certainly increased in the MO community which can be demonstrated by the numbers of daf yomi attendees and the numbers of shiurim given in the same shuls compared to 30-40 years ago.
I think one of the biggest question on the MO community is the numbers of yeshiva and kolleit in post high school yeshivot. Think about how many more yeshivas there in the yeshiva world compared to 30-40 years ago. BMG alone went from 2,000-over 6,000 from 1996-2017. MO has YU and it is debatable if Chovivei Torah is included. Why have the numbers of their yeshivaliet stayed the same? Even many of the YU Roshei Yeshiva send their sons to Chareidi Yeshiva gedolahs.
Dikduk bemizvtos has made great strides in the MO community but it still has some pockets where it stayed behind (as have pockets in the Chereidi community).
I think we should also appreciate that MO did kept yiddishkeit alive during a time when people thought you were crazy for staying frum. Perhaps now that the non-Orthodox movements are on the decline it is possible that the MO philosophy is not as necessary and all Orthodox Jews are blending together much more with less polarization.