i think we have to do a little from Column A and a little from Column B here.
Yes, RR has trauma connected to SCD. This was not entirely unforseeable because of previous years, and confirmed by subsequent years.
I believe her - but i have very little sympathy for her because she comes across as a thoroughly dislikeable character. that doesn't mean i don't take her woes in this regard seriously, just that i care less because she uses her fame to get things she wants too.
So what can we do? For starters the BBC need to take much more care of their contestants and maybe be much more upfront about the hours they will be required to train (still lol-ing at the idea of Jerry Hall just jacking it in for tea at clariges)
I also think, given the clear make up of each phalanx of contestants, that they need to identify which ones are going to be at risk of problems. It is always clear there's an old biddy nobody thinks will have a chance but is actually lithe and fit (Felicity Kendall) and an old biddy who can't keep a beat (Anne Widdicombe). A young starlet who has done all the training and already danced on stage (erm - i don't know any off hand but certainly all the ringers from the last few years) a middle-aged presenter/politician on their way to retirement but having a last fling - and/or converting their serious MP/newsreader persona to something more fun in the hope of further presenting work. etc etc. The BBC know already which ones are likely to be in the later stages either because they can dance and the judges will save them, or because the public will save them week after week.
It can't be rocket science, most of us are able to identify the winner by about week 4. (I've stopped watching, i think the format has slightly changed?)
All the over-the-top "we're a team" (Jeanette, is that the dancer? was awful for this, and pushing herself to the front of the group, even when she was out)
anyway, the TL;DR is: the BBC need to employ therapists.