My enjoyment of KH2(/FM) is extremely personal, so probably not for me.
I definitely think there's a chance for it to at least be on par with how much people love 2FM if you give it some time to settle. After all, I think it took time for people to come around to KH2 in general. Even now people still dunk on stuff like the Roxas prologue.
Some might not be able to resolve how the story sits with them though (and that's not really going to be mended with a patch), along with the lack of fan-favorite original worlds and FF characters (this has the potential to be fixed). The graphics and level design are a hit for the most part though, so with more balancing and some additions via DLC I definitely think people will come around to it more. It's kind of absurd to see how much people either defend the game to death or act like it's a -3/10 though... definitely gives me early KH2 reception vibes. On top of that, a lot of the game's failures aren't exactly unique to KH3 when compared to other games in the series.
I think there's a lot of interesting and great criticism of KH3 floating around, but at the end of the day it will all come down to what the general consensus values more in the series. KH3 offers these really detailed Disney worlds to explore, and for a lot of people that's the sort of thing that makes them glad that Kingdom Hearts exists in general, even if it misses the mark at times.