I think FR are realising that more people want to take winter hoidays to sunny destinations, and the Canary Islands are the best place to go. LS operated these routes last year, and have this year added LPA to their schedule and also expanded on their Tenerife and Lanzarote routes.
I think FR are trying to get a good foot in the Canary Island market before EZY turn up. They are getting nearer! (Madeira!)
Personally, I think this is a good move by FR, and I wouldn't be surprised if TFS isn't turned into a base before long!