There are already other changes besides SMTs in the hard fork. There is a certain ideal about 'one change per hard fork' but in reality, hard forks are too infrequent for this to work.

This change has the advantage that it is extremely simple in terms of coding, which is an absolute requirement for anything to be considered this late in the development cycle. That makes it feasible to even consider.

Nevertheless there are certainly people who don't want the 4-week change, albeit that seems to be somewhat of a minority.