I don't really know about that. It could easily get much worse.
We are currently 6th and will most likely still be able to secure European football at the end of season thanks to numerous wins we got despite not deserving them. Our expected points based on performances would actually have us around 12th or 13th, which I also would agree is the level we have been playing at throughout the season.
What could quite realistically happen next season is that our luck in games will run out and we will regress back to where our performances should normally see us. There's nothing in our performances over the last 12 months that indicates we are likely to get better and be closer to top 3 teams than we currently are.
We do write off seasons very easily here though, and have been acceptant of mediocrity for a long time, so fully expecting ETH to get at least 1, if not 2 more 'free pass' seasons before we make any moves. We are the only big club in Europe that genuinely considers it completely fine to have horrible full seasons. Other big clubs usually call for change after 2-3 months of below par performances. Imagine Real, Bayern or Barcelona being OK with where we are.