Its not like we're getting internationally well known A-list 3rd party characters on the level of Cloud and Ryu this cycle. Even Dragon Quest arguably doesn't have a character as recognizable worldwide as Toad or Waluigi to say nothing of a good chunk of 3rd party characters people here bring up like KOS-MOS, Lloyd Irving, Pheonix Wright, the Chosen Undead or even Monster Hunter. The "popularity" argument used against 1st parties feels like a load of Hogwash considering Joker is in at all and Hero is in before guys like Crash and Steve.
Frankly, Bayo, Joker, the Belmonts, and arguably even Hero have less potential to expand the audience than a huge Nintendo character like Toad/Waluigi/Isabelle/any popular Pokémon simply due to the sheer disparity in terms of how many people know who the later are. The likes of Snake, Ryu, and Cloud do but we're haven't actually got a 3rd character as well known as any of them this cycle.