I have been pondering this, and my pondering has made me more confused. 
Fwiw, mnsn is reasonably new in comparison with, say, skinuk. And sn isn't the mn raisin d'être. (despite this, all good, the mnsn community has built up, but as a matter of course is still largely parents of younger children - this will change as time chugs along, obviously. The hiccups referred to that 'changed' the nature of the mn board have also prompted change in similar sites - (notably the Tia/ lanie tragedy and privacy concerns for skinuk etc). Media interest isn't new, but it has to be remembered that the mnsn media frenzy was instigated as a means of support for poster, whereas the skinuk interest was as a result of an external tragedy iyswim.
(rambling continues apace). Skinuk used to be all in one - teens and young adults mixed up with newborns and toddlers, not sure what they do now as I don't pay for membership (maybe someone can enlighten?)
I kind of see 2shoes as a Robin or Tia (I have no idea whether y'all know what I'm banging on about or not - but hopefully there are enough posters who use both sites to see where I'm going). Yes, posters of older teens/ young adults, some going through transition to adult services, some negotiating post 16. Usually these posters were in a position of 'giving' advice and support, because they had a wider experience of all things sn, and were old hands at negotiating the system. But sometimes they needed (and need, I assume) support, too, which certainly on skinuk was freely given. I haven't noticed any lessening of support offered to parents of older children (and I use children in all senses, inc young adults) on mn, and I wonder if it is as a result of infrequent posting (now) and newer posters not recognising faces, and so not being specific enough in the support offered? Everyone on skinuk knew that robin and Tia were the 'old guard' and responded accordingly. I don't see it being any different here, tbh, if faces are recognised.
Not having experienced an issue doesn't preclude anyone having empathy, tbh. And offering a shoulder or bouncing ideas around. I'm sorry that 2shoes and dev feel excluded. I do pop on occasionally and respond to posts in the middle of the uk night, but hadn't been aware of any ostracism. I know I've chatted to dev once or twice of a difficult night. 
I think the support is here if you are prepared to accept that people won't have the same experiences (yet) but I do agree that this is probably where a more specific sn board like skinuk can offer a parallel support system for those in transition, where you will find those who have been there and got the t shirt. But if you do hop over, please do use mnsn as well! Otherwise we run the danger of the board only ever being a dx support board. we need to woo our parents of older teens so that they become the robins and Tia's of mnsn. The fonts of all knowledge etc etc.
I use the term lightheartedly, with the understanding that the lovely ladies named get as much support as they give, when needed.
A note of warning. I find skinuk harrowing as I am there so infrequently, and the complex issues of those involved mean that the bereavement board is a sad necessity. It is a different place.
That said, the cp-ers have taken matters into their own hands and are chuntering away on their own support thread (got to get away from all this asd stuff somehow 
) so I think the sn board is largely evolving of its own accord.
Anyway, congrats if you managed to wade through that and realise there is not a conclusion to be drawn but I wanted to get rid of the stream of consciousness drivel that has been buzzing round my head.