People gotten used to the idea of "Same as existing but more/small additions" should actually be a DLC/addon, not worthy of incrementing the number and being a successor. For those, you need to completely change the entire thing to something else, then people are fine, and it's a hit/miss if the existing players like it.

Otherwise people feel like the parent, that it's just slightly different than before but incrementally improved, and should therefore be a DLC.