The whole PDGA model was based on Ams being spectators (remember, we were faking it 'til we made it) and the flipside of that was the open players and am players were at the same parks playing the same courses hanging out in the same parking lots between rounds, the same flymarts, the same players parties...disc golfers got used to having A LOT of access to the Ken Climo's and Barry Schultz' of the world.I think the big draw of having the am tourneys on the same weekend is that ams get to go watch the pro cards and go to the pro fly marts after their rounds. You typically get smaller am fields when they are on different weekends. Maybe it's not such a big deal now that no one is having a hard time filling am A-tiers these days.
Now that whole model is out the window; it doesn't work anymore. Clubs that have literally spent decades planning their whole existence around "if we do this and that and then somebody finds a sponsor maybe Paul McBeth will come to our A Tier" have to pivot; Paul McBeth is never coming to your A Tier. We literally no longer have any responsibility to prop up pro disc golf. That is DGPT's problem now.
Cutting lose Am's from events like DDO and DGLO is just going to be a step toward that. Any event trying to cling to that old "one size fits all/Open and Am's all in one place" model is going to have to come to grips with that.