The gameplay's just so much better than WZ2.
They would have to fundamentally change everything about WZ2 for it to match up with the original. IW clearly wanted to go in a different direction. They aren't gonna be the ones to change it.
I truly believe Warzone 2 is gonna bleed players over the coming months. It just doesn't have the fun factor of the first Warzone and that includes Caldera.
On a side note, from a business standpoint, I can't believe Activision allowed IW to change the loadout system. Why would anyone buy a blueprint when it's so much more difficult to get loadouts in Warzone 2? Plus, the upgrading system is so convoluted. I could figure it out but the grind to unlock things is ridiculous. What casual players are doing all that? People wanna use the guns they like, not be forced to use everything in the game.