What’s crazy is restricting Mystic Forge and expecting to have any lasting impact. You are band-aiding the real problem in that Vintage manabases are too consistently powerful.
Workshops can consistently drop a 4 CC spell on turn 1/2. Dredge can consistently mulligan to a single card and then hit creatures on its first dredge. Blue can consistently fix a 3 or 4 color manabase with basics. These break fundamental balancing rules that cards are printed with in mind now as none of these mechanics are returning.
What will be printed is another Mystic Forge.