I personally don't see how something like Puyo Puyo is "more niche" or "less likely" than Streets of Rage
Also yeah, I get being tired of the Sonic/Yakuza/Persona stream and all, but I feel like literally every time SEGA pops into discussion, someone pipes up like "wow they sure have a lot of dead franchises amirite fellas? ahyuckhyuck" to the point where they become almost entirely pigeonholed as The Dead Franchise Company and almost all discussion of them revolves around how they're an evil company that killed your family because they didn't make Ristar 2. Not only are they not unique in this regard - almost every major long-running video game company has a veritable backlog of dead properties - as has been pointed out, like....of course they're going to have a lot of dead series because they've been for over 60 years in the business and were insanely prolific. Not only that, but the main sticking point here is that a ton of the old major developers who worked on these old properties are not at the company anymore. They saw a huge exodus of major talent in the 2000s, and we've recently lost people like Kodama (who died) and Nagoshi (who was kicked out) as well. Sure, you could make new entries without them, and they look to be doing just that in the future, I'm just saying don't be surprised if a series whose creator left SEGA a while back hasn't gotten any new games in a while. It really feels like sometimes ppl forget that people make games, not companies, and that SEGA isn't a singular monolith that has remained entirely static for the past 40 or so years.
I'll be honest, like....I feel like there's often a bit of a divide between the way certain people talk about SEGA. You have the more hardcore fans who take a deeper interest in all the history and know how things work, and then you have the ppl whose SEGA exposure is more surface-level and mostly comes from stuff like All-Stars Racing or the Mega Drive collections, but who consider themselves just as much of an authority on the subject. And not to sound like a snob, but oftentimes it really feels like it's the latter group who keep regurgitating these narratives that are kind of false but have been repeated a million times and have become The Go-To Cool Thing To Say whenever SEGA is the topic, such as, indeed, the whole "SEGA hates their old games where's jet set radio 3" dealio. I can really tell the difference in perspectives here and it can get quite annoying.