I believe the only reason they don't list a wallet there is because It's not secure enough just like they did with Blockchain.info so what's the case for Multibit HD and what's the issue preventing them from being listed there?
I think this is good move from Bitcoin.org because we can not consider Multibit wallet reliable and secure.I use Classic version until it just stop working normally,(every time wallet is open-need to sync again)and I see many problems with HD version also.
All users should stop using this wallet even if they do not currently have any problems.Without support and development this project is over for now/maybe they will continue to work on wallet in future,but in that case it would be difficult to restore the user's trust.