The problem with using all these websites is that it requires multiple login accounts. And frankly, I think everyone is tired of creating accounts.
Imagine having an account each of these: Wiki, Bugs, Trello, UserVoice, etc. The user will simply give up, it's just too much.
The only solution would be to create a server with CMS, but that's time consuming. It would be better if these services are already grouped under the same umbrella and ready to be used.