Possible low cost markets

Hey guys.
Ive been thinking over the last few days about new destinations or hubs for low cost carriers.
The UK is pretty much covered but there must be plenty of markets thats havnt been touched.
Paris is one but AF pretty much have all the slots sown up but what are the chances of Ryanair making Beauvais a hub. It surprised me that it isnt already one.
There are a few other cities around Europe which seem untouched like Lisbon,Athens and Naples which has about 2 million inhabitants.
Id just like to ask everybody what they think about new routes we will see or new hubs being set up.
I think it will make an interesting debate.