I feel like after they got Bruno and Bey back (and it flopped), they won't ask Katy again, just because of that association. She'd undoubtedly do a better job, but once bitten, twice shy...
There are so many possible options for next year's SBHS. Gaga really did kill the anthem and her management is insane right now, so I wouldn't put it past her. Taylor, Adele and Justin are all in the mix but they seem too young/current to be playing it. Rih could do it tbh. I could see them pulling some random old band or country superstar next year, out of the blue.
Either way, I think Katy's is definitely going to be the benchmark for some time. Queen.

And people thought she wouldn't be able to pull it off.