Hell, people don't think it's the "real" League if it's not the Big 7.
It's the biggest hurdle to getting a new team up and on its feet. And not just a new League team, but any team. Too many readers will say "New team huh? Well why should I read it? The League's the best of the best so what could these other folks even offer?"
It's why I think Dick needs a team that isn't the League, and isn't the Titans. Neither name is going to elevate the group; calling themselves the League won't fly because they're not Big 7 and readers will look at them as a stop-gap, temporary thing. Going by the Titans name will just be seen as another reunion and those don't sell.
I do like Justice Alliance. Or Justice Nation maybe? Justice Legion still has a lot of appeal for me, it harkens to the bright future of the 31st century and is also a name that Morrison used in DC 1 Million, and while that's not a lot of precedence I feel like a new group such as this will need every slight advantage it can get.
Not sure if Jon and Yara would absolutely be used. A year or two ago, yes, and I think Dark Crisis started with the intent of building them up to it. But Wonder Girl couldn't maintain sales, Jon's book ended up being cancelled as well (with a mini to wrap things up, it seems) so I don't think DC sees any major financial gain there. They might still be used, it's not like they'd hurt the book or anything, but without quality sales to help drive the decision I don't think they're as locked-in as DC was likely thinking they'd be. When AT&T/WB first launched the Future State stuff, they had a lot riding on Jon, Yara, and Jace, and thought those guys would be ideal for larger media adaptations. Now, WBD doesn't seem as hot to push them. I still think they'd be ideal members though; they carry important mantles and are popular (just not popular enough to carry a high-selling book) they're still fresh and there's a lot to do with them.
But if Dick still does get a League-like team, I hope it includes more than just him, Wally, and the new kids. Nobody gonna buy that a bunch of rookies are the first and last line of earthly defense. Gotta add some Mr. Terrific, some Vixen maybe, some Black Lightning or Dr. Light. Some folks with experience under their belts who can believably be counted among the best of the best within the fiction itself, if not the sales chart.
Actually built a roster for this one day when I didn't have enough to do. Ended up looking like a next generation Satellite era JLA.