Thymeout I think ISIS is a more credible threat than Al Quaeda because it has shown the ability to mobilise troops and finance a conventional war. If they can do that, they can run a country.
I am not sure about this. I remember back in the mid noughties [?] that there were reports that Hezbollah were concentrating heavily on learning, understanding and discussing methods of civil and public administration. There was a report around that time that said Hezbollah representatives were present at some EU event, and all they wanted to talk about was issues of civil administration with the European delegates present -- much to the delegates' surprise.
Now, at that point, Hezbollah ran an incredibly efficient military structure. They also had a very well-established network of charitable welfare ... but they recognised that actually running a country was a very different kettle of fish.
Indeed, this has historically been one of the problems with toppling any regime anywhere -- Communist, Baathist ... etc. The entire civil service, the only people who actually know how things run, and the heads of key service areas are often tainted by association with the previous regime, often being active members of the Communist Party or the Baath party.
Indeed, if membership of the regime's ideology has been necessary to work at any level in the majority of industries, you can end up with junior mechanics, assistants and teachers being members of the regime.
So to remove the regime, you need to remove these people from positions of power or authority ... but no-one else outside of the regime structure knows how to do these job by default.