Tournament experience should be recommended, not required. Someone who has not attended a tournament can still know a lot about the game. Granted, it is preferred that you do have some sort of tournament experience, but it's not like attending tournaments gives you an absurd of information you could never learn if you never went to one.
There's actually an
extremely notable difference between people who have never gone to tourneys but spent their time studying the game, and a person who goes to tourneys but never spends his time studying the game. The one who studies the game will immediately be a better player as soon as they grab a controller and play, since the one that never studies never improves.
That said, one that studies the essentials AND plays in tourneys beats people who study but don't go to tourneys when it comes to character and stage discussions. One can learn things like frame data, what move should beat what, why X thing works... But when you play, you learn that things aren't as black and white as data teaches us. There are varying playstyles: Falco could hands down lose against Kirby if he played in X manner, but he's able to win when played in Y manner. When you study the game and never go to tourneys, all the data suggests is that X beats Y, but when you go to a tourney and experience how volatile match results can be, you realize that even though X should beat Y, given the right thought and use Y can also beat X. And this is something that can only be studied deeply by playing matches at top/very high levels against many different people.
So if we were to create a new way on how to add people into the BBR, I'd say requirements should be:
1) Lots of smarts and lots of experience (top players, famous TOs)
2) Lots of smarts and less experience (top/high level players, recognized TOs)
3) Less smarts and lots of experience (non-top power-ranked players and lesser TOs)
4) Lots of smarts and little-to-no experience (community members who usually never go to tourneys, but everyone agrees would be a great addition to the group that leads their competitive scene)
5) Everyone else
Everyone in 1 should be able to join whenever they wish to, and no one in 5 should be able to join. The lower you are on the list, the harder it would be for you to join the BBR.