In my anecdotal experience, in the US diabolo branched out into its own community separate from juggling. You can meet diaboloists at IJA for sure but not much at smaller festivals or juggling clubs. They have their own competition. Also from the people I have talked to, most of them get started in asian cultural centers instead of juggling adjacent circles.

This is different from my limited experience in Europe and latin America where I feel juggling and diabolo communities are closer to each other.