Plus how can the club gain any momentum and come back when relegation also means financial disaster (Ref Martyn Sadler).
Massive shame if they go and for me the only way to part rescue the situation is to get Toulouse in, anothr player pool that could lead to proper internationals.
This will also be the case for Castleford, Hull KR, Widnes, Wakefield or anyone else who gets relegated. That's the price that is paid for failure.
Whilst it might be a massive shame if the Broncos go, it will also be a massive shame for those other clubs.
On the other hand it will be a great boost and a very positive step for any team that replace London, be it Toulouse, Featherstone. Halifax or whomever.
In the long term, it will be a test of the strength and corporate management in place at the Broncos, as to how they bounce back from any relegation. At least the opportunity will be there via p and r.
Castleford, Huddersfield and , long ago as you pointed out, Wigan bounced back and overcame the disaster of relegation.
Huddersfield and Wigan overcame it so well that they are in the top two or three in SL.
If London are relegated and cannot bounce back, then maybe the underlying strength of the club was never good enough to begin with and they should not be in SL as a result.
RL in London will not die with the relegation of the Broncos. Fortunately, the roots that have been put down there are deeper than that from the amateurs, to the juniors, to the colleges and schools teams and the the CC1 clubs. There is a platform from which a SL club can re emerge in the future.