I don't believe it's possible to predict whether or not a new multiplayer ip will be successful. And I mean that for cases where people already know what the game's mechanics are, know exactly what each individual member of the dev team specialises in, and so on. Here nobody really knows anything beyond studios and concepts.
Sure you can read the market and speculate, but successes are usually only obvious in hindsight with all the failures quickly forgotten (lawbreakers, evolve, hyperscape, etc)
Though with them being gaas, they could just throw money at the games till the chances go up eventually (ffxiv, sea of thieves) but nobody knows for sure.
But then, I also don't know shit, so maybe one of you will predict exactly which games will end up massive successes