Do you think there will be a marvel team-up on disney+?

You mean as a group like Avengers and Defenders? Falcon and Winter Soldier appears to be a team up so I'd assume you meant that.

Maybe. They could potentially get She Hulk, Moon Knight, Ms Marvel and Hawkeye's daughter but I would doubt it myself.

Pretty sure it will as that's sort of the big advantage of a shared universe and roster of characters, otherwise they could just do it all as stand alone elseworld type shows, as for wanting it, well yeah if they do it right and make it make sense, not just a team up for team up sake but if the story actually lends itself to it, Defenders wasn't set up right so it didn't really work that well, sort of how the Arrowverse crossovers are fun but meaningless because every one really is just stand alone stories unconnected to anything in any of the 1st 1/3 of any of the single series, which is why Crisis this year will probably be so much better because they are building to it.

Imo atleast.