They already tried this with Primal V1. Adding more powerful tiers of the same gear adds nothing to the game except botters win even more.
Better idea, allow us to fix regular Primals. Let us reroll all Primal affix slots at the cost of say 5 or 10 Primordial ashes and 10,000 dbs (so people may finally quit crying about having so many dbs). Now when you finally get that primal for your build it can be fixable instead of 90% of the time unusable.