I wouldn't disagree with much of what you say Jon. Tan just walking away would be a huge, possibly fatal, blow for the club - there's virtually no chance of that happening though.
However, if it really is Vincent Tan's desire to leave the club in a better state than when he came into it, then I can't help thinking that he needs to sell up quickly. I say that because, although I'm more optimistic than most it seems about our current squad, we're only heading one way based on how the club has performed on and off the pitch this season and last. It may not happen this season, but we're heading for League One if Vincent Tan continues with the present approach and once we're there, any claim Tan has of leaving us in a healthier position disappears.
As for potential buyers, I agree that it's harder to find them post Covid and in the current economic situation, but I don't think it's impossible - I'm sure that if word went out on the football grapevine that Cardiff City's owner wanted to sell up quickly, then there would be potential buyers out there.
The imponderable in all of this though is the Sala situation and I believe that's the most likely reason for the inertia around the club at the moment. I read recently that City are planning a further appeal against the Arbitration in Sports verdict - it's hard to see how this can benefit us and I think we should just accept the verdict and look to the future now, but I fully accept that it's easy for me to say that as it would cost me nothing.
So ,my guess is that Tan won't be going anywhere until we've reached the position where there are no more avenues which could exonerate us to be explored. However, if we do that, then the likelihood that our owner will be able to leave us better off than when he came in declines dramatically - if current levels of backing and interest are continued.