That's a fair point, there is potentially a cost to keeping ETH if we don't improve. So it's about balancing that cost with the cost of other scenarios, such as a caretaker coming in and taking us even further south, as our most recent caretaker did, or permanent manager coming in and achieving largely the same result, but being expensive to move on if they we don't see them as a long term target, etc.
Really it's all a balancing act, my opinion is that I don't see anyone immediately attainable, who is willing to come in as a caretaker, who will improve things (football wise yes, but the pressure would crush the vast majority of applicants).
If we can convince Nagelsmann though, I'm all aboard.