Attendance faded downtown when "the novelty wore off" because people were buying obstructed view seats that couldn't see one of the goals when the novelty was ON and once you've done that a few times, why are you buying a seat that requires a monitor to see what's below you?
No one said they need to make the playoffs to be "viable," they need to make the playoffs to create new fans. That's how bandwagons work.
I find everyone's definition of "Viable" incredibly stupid since it's been 15 years or so, and they're still here; and attendance matters so little that MLB sold zero tickets in 2020 and everyone remained the exact same level of viability as before.
Being a member of the league essentially makes you viable.
Take your pick on which road we take. We can take the road where we talk about how ridiculous it is for a team to have several hundred million dollars in debt, no arena, had horrible attendance WITH minor league level pricing (prior to Mullet arena where they have horrible attendance WITHOUT minor league level pricing), a history of ownership issues, a current owner that has question marks, receives max revenue sharing, horrible tv numbers, and is losing 10's of millions of dollars a year, yet somehow that's considered viable to you.
We can also go down the road how the reason you can talk about the MLB like that is because of how their tv contracts and luxury tax system works and makes it so that you can have teams in that league who's entire payroll is covered by just the revenue sharing. We also know that some of the owners are pissed at teams like that and would want to put in a salary cap floor.
Maybe there are other roads that I'm missing.
Either way, I would say that your understanding of market viability is.....lacking.