If Alexander Hard Mode Gear is i190, that doesn't devalue i180 gear entirely. It was also the same with i110 crafted and i130 gear where some crafted pieces (Helm, Belt and Earrings) where far superior than their i130 counterparts in raiding scenarios. It it turns out that the Alexander Gear lacks any Skillspeed gear, then we'll be using our Law gear in certain slots. Example, the Legs.

But, if Alexander hardmode gear is absolutely loaded in Determination, to the point where it can outweigh a 14PPS deficit of not using a Geirskogul (otherwise your BotD will fall off), then the rotation will change and we'll just be absolutely stacked in Determination until we can outweigh that 14PPS deficit.

And that's a lot of Determination and Critical Hit Rating to make up a nearly 60DPS loss, so I really doubt Square Enix will make such a decision.