I re-read and still don't see the issue.
1) We don't have to care about how many teams participate => we can make an old-school competition with 5 participants, no problem.
2) Prefer 'fun 20-team' contest over 'boring 30-team' contest => as long as it's fun, we don't have to care about the quantity of participating teams.
So, we can have as much legacy stages as we want. If there's only 5 teams competiting, that's fine for us. As long as it's fun for those participating, it's all good.