The difficulty is not particularly Versus XIII's development itself, but what has been going on with Square Enix's HD development in general. For some reason Square Enix gives precedence to every other game over Versus. XIV 2.0, in particular, has been crippling its development most recently.
I always felt like that after FF14's collapse and the general distaste towards FF13, despite not outright being a sales disaster forced them to put Versus to the side and focus on fixing those two products.
Which I think was a bad idea. Versus has hype behind it. Sure it's not easy to spot now because like 70% of the people interested in it are convinced it's never coming out, but people still want it. While I'm not interested in Versus myself, I admit that what was shown from it looked pretty impressive, and I think it would have really helped to clean up whatever damage FF13/14 did to the brand's image.
But instead of doing that, they just continue to push things that people feel lethargic about. FF13-2 fell off the radar incredibly quick after release. I don't think the 13-3 scenario will go any differently.
Square Enix is looking bad because they are still stuck on FF13 while the rest of the JRPG industry is moving forward and has been since FF13 came out. We're getting ready to shift generations and they are
still stuck back in 2010.
Not to mention their localization practices, which are absolutely dismal to virtually non-existent.
It's just really frustrating to watch this happen to a beloved company, and it's almost entirely all their own fault.