Whatever happens to the MCDV's themselves, I hope that the RCN retains an in-house mine warfare ability. It might seem all too tempting to go with an "all teeth and no tail" corvette while doing something like say, pushing mine warfare duties off onto rented civilian vessels to save on money. Modern minesweeping techniques allow for some very different methods of dealing with mines however, I hope we won't be stuck holding the bag when we need the capability because somebody decided to shuffle it off to a dusty broom closet.