EZY...
Regarding EZY...
If you look Faro (FAO) is not even on sale from Gatwick from next May, either is Funchal (FNC) for that matter, though the Funchal route is available ex Gatwick for the winter period. Doesn't mean they're dropping it from Gatwick though does it?!
Fuerteventura is very popular and generally always full. The only London gateway for this route with EZY is Stansted, so unless it's moved over to Gatwick I very much doubt this route will vanish completely. Southend I don't believe will have the runway length for full load operations down to the Canaries.
And finally... EZY are only on sale for a limited number of routes May/June so don't jump your guns, give them a chance to get the full programme on sale.