User blog comment:LuciaHunter/μ's Go→Go! LoveLive! 2015 ~Dream Sensation!~ Live Streaming Day 2/@comment-27273852-20151123163829/@comment-24187738-20151123174918

You seem to be confused on a few matters. Firstly, they always put all the new songs in a live concert because that's what the audience looks forward to, not because they'll run out of new songs. The reason why they put old songs is to both fill up the time, as well as needing to perform their classics as that's also something very important to the audience. For example, you would never attend a concert without Bokura no LIVE Kimi to no LIFE or Snow halation.

The second point is, you might want to do more research into what Hata Aki actually does as a career, and the length of her entire works. She doesn't "focus" on any one series at a time, and both Love Live! projects will never get to the point where their releases are frequent enough to give her trouble.