The problem with the dwarves are they've been pushed to the side this arc. They just don't feel very important and Oda hasn't given them a lot of focus outside of their mission.
The only one (as I've said earlier) that I'm holding out for would be Manshelly since she might be different in personality from the other dwarves. The naive personality of the dwarves aren't really distinct from Chopper and maybe even Luffy. I personally think based on early crew sketches that some of Oda's ideas for dwarves were transferred over to Chopper. Instead of being a tall swordsmen raindeer he became chibi, naive reindeer.
Again, the dwarves are really playing a side role this arc. So far it seems unlikely that Manshelly will play a main role and so far seems unlikely to interact with Luffy by the end of the arc.
Franky family has been pushed aside before also. But it turned out the boss villain became the nakama. Besides, Luffy haven't seen the dwarves yet. Maybe when she see Monshelly he will invite her.