Ryanair won't open a base in Paris BVA airport as a lot of flights have to be diverted and every diverted flight costs money. Even though ILS CAT III won't be braught into operation until at least November. Flights cannot arrive or depart between 11:30pm - 7:00am. because of the night flying ban. Most Ryanair flights depart around 6:30 and don't arrive until around 11:45pm so a base in BVA would not work. A Ryanair a/c based somewhere else could make more money.
A new Terminal is due to open by the end of 2010