Montcalm County would like to switchover to the MPSCS, but they have one major problem: money! Unless they can come up with some federal grant funding, I don't see them making a changeover anytime soon. For now, they will continue to operate on their VHF system.
I, do however, know that their EOC does have a base radio so they can talk with other counties. Likewise, their 9-1-1 Center does have the ability to talk on "STATW6," so they can communicate with other counties in District 6. However, everything else in Montcalm County is done on VHF-High band.