Whilst FR and EZY are known in Spain, I doubt they would come close to the brand presence VY has in Spain. One thing CWL, and the Welsh Government is looking to do is attract visitors to Wales. VY are giving the opportunity to bring the Spanish to Wales, something that has been stated before.
Likewise with LH, the OS charters and the more recently failed Helvetic route.
If Vueling realise they have the Welsh market ready to go, its more than half their job done in attracting passengers to travel both ways, rather than just taking the Welsh on their holidays, they have the brand presence to bring the Spanish to Wales. The likes of FR, EZY, LS and MON would be the opposite in concentrating on carrying the Welsh away from the country as their brand presence might not match VY's in Spain.
Whilst I think a base is a long way off, the routes VY could operate could easily fill 2 aircraft with just mainland Spain, Balearics and even the Canaries.
The question is, is it running before they can walk? I think 2013 will be a defining year for VY at CWL.