What I took away from the meeting discussion - UDJC won’t compete against them. My impression (I can’t speak for them) is that UDJC is not trying to go up against the traditional shows. Rather, to offer an alternative for people who aren’t well satisfied with the traditional shows. Again I can’t speak for them, but that was my impression of their purpose.
People who are already functioning well in the traditional USEF-umbrella formats don’t need UDJC, so therefore are not the target audience – that’s my understanding. They probably won’t be interested in any case. Based on his meeting remarks – although I can’t speak for UDJC.
People already happy in the traditional show format might take an occasional UDJC show as an informal, off-piste alternative for schooling. Not leaving a record in a USEF organization. Perhaps for a green horse or newbie rider. Kind of like a schooling show or jumper show now, with more open entry options at different heights.
My impression is that the real target is other riders who focus less on showing, but who do enjoy getting out to a few shows a year, who will be better served by the UDJC format – that’s my takeaway. I count myself in that lot.
The traditional formats don’t work well for me and for some others. The traditional show restrictions on cross-entering divisions alone limit what they can do in the traditional format. The timed jump-offs for tiny/small-jump jumper classes are not good, IMO, I’m agreed with UDJC on that. But there is no getting around it, that’s the only way the jumper class is offered. Some of us think hunter judging rewards the wrong things, although others disagree – but for those who think so, UDJC may have an alternative we like better. It doesn’t have to have the label ‘hunter’.
USEF sails onward as always. UDJC offers an alternative for those who appreciate and/or can get something out of their focus.
I do think there will be a major learning period during UDJC’s first shows and some things will change.
Major caveat – If I’m correctly understanding what UDJC is saying! LOL 
Hopefully UDJC will check in and clarify if this is a correct impression or not.