While SQ upping its ante with a new class beyond first, MH is spiralling away from its 5 star status in Y. Alas, affected flights are those with high volume of locals, thus the 5 star status would probably not affected.
My personal evaluation, MH is already below 5 star, no matter what the Skytrax poll says. You just could not depend on the lovely FAs forever to maintain the status. If I am paying my own fare, it will be AK or non-MH flights from now on, however sad and unpatriotic it may be!