Hmmmm. Saying that you can't have another Exeter conveniently ignores Bristol, who are doing OK at the moment after several seasons of trying to get promotion.
Saying that if Bath went down, the competition would be meaningless is also wrong, as Bath don't actually meet the criteria for promotion as far as I am aware, due to their ground capacity (and I'm sure there are others).
It is a conundrum, and relegation is really not pleasant, but how else do you make the second half of the season in any way meaningful?