Ok I've been thinking this through. Neither RTWP nor Turn based make sense for a multiplayer game
Turn based is boring if one of the player takes too long (I am looking at you Scythe ) RTWP is essentialy RT since nobody gets to pause the game.
Now, let's take a look at how some japanese RPG do it : intiative gauge.
in multi, each player could choose an action during a turn that last 6 seconds then all actions would be resolved according to initiative. in solo play, it would be essentialy turn based.