I think Nolan's trilogy could have been interpreted as a setup for the older, more experienced Batman seen in BvS, but by itself they're not a great presentation of the character and the Nolanverse definitely wasn't ready for a Justice League. If the trilogy had dated itself a couple decades (say, ending in the late 80s), omitting the middle of his career and jumping right into a more mature Batman that's been through a Robin or two, it could've worked.