You know, not all Lustres were created equal to begin with. My Swimming and Aquadisiac always behaved much differently than my Filament, Forgery, or Honey Lust. Swimming and Aquadisiac were good to me but the rest just flaked, flaked, flaked and never did adhere properly.
I'm surprised they are discontinuing Glazes as MAC seems to be all about the sheer lipsticks in recent years. My guess is that a "new" lipstick formula will come out soon (if it isn't already announced--I'm out of the new product loop) that will replace them but still be nice and sheer and probably even carry quite a few dupe colors.