There are a lot of good discussion sites running terrible software, like LtU and Perlmonks. This would allow them to keep their communities intact but actually run software that doesn't actively discourage contributions. (Ever use Perlmonks? That's why people hate Perl!)
But I'll be damned if I can't think of a worse fit for any of these people than a SO-style QA-wiki. The last thing they need is fucking badges!
Duplicating SO makes no sense to me, duplicating SE makes a lot of sense to me.
Or you are in a country that Fogcreek can't do business with
Or you want a site on a topic that FC, or their bankers, or their VC or their government don't want you to have one on
Or you want an internal secure site for your society, company, hospital, police force
This is the real win in my opinion. On the open web, the SE sites are not just about the technology -- that is quite a small part of the problem.
Internally, especially in smaller companies, involvement is less of an issue and the technology becomes are more significant part of the problem. This is where I see a lot of opportunity for Shapado.
No company is going to have it's knowledge base on someone else's servers - especially not any industry 'knowledge rich' (urghhh) enough to need an SE site