In about 10 years it will happen. Which is good timing in a way because once a Justice League happens (with a possible sequel in 2018) and 2 to 3 Bat-solos (with a primed up Bruce Wayne)...they wont be looking to reboot but to do something fresh.
Batman Beyond will be the perfect concept right after. The bad timing is only to do with Uslans suggestion. Clint Eastwood as Bruce Wayne. I dont think Clint would do it anyway but the only time to go for it would be in a few years. That wont happen unless they really shake things up and keep JL Batman young and exclusive while tying a Batman Beyond franchise with Clint playing the older Bruce and another younger actor in the role of Terry. Which sounds confusing for the general audience.
So 10 years sounds like the better plan. But with another actor who may be in his 60s or 70s at the moment taking what could have been Clints spot.
There's also the amalgamation idea that WB may step into. Y'know..the 1 thing the fanboys hate. Making Blake Batman in Justice League. If this happens you can bet ur ass WB will take Uslans suggestion and run with it. They'll do a Batman Beyond (instead of it being close to Bladerunner, it will be closer to Looper) with JGL's John Blake, replacing a character like McGinnis for Blake, and do a version of Beyond. They'll write a script with hopes in getting Levitt and Bale on board and if they dont accept it'll become another fan-fiction like Aronofskys Year One. Which is bound to happen.
Seems like there's only 1 option. a 2020's Batman Beyond. The cartoon coming to life. Set in the far distant future.