Sir George Cayley,
I think they are indeed hoping to get longer routes, and even transoceanic flights. I do not know how realistic that is, since SCQ is only 65km from there and they only have one "long" flight (assuming a 2,000 miles flight to Turkey can be considered long). And SCQ has already a 3200m runway.
I think the photos in Street View are a bit old. I believe the green poles are now part of the structure supporting the artificial reference surface for the radioaltimeter, which starts 400m before the threshold or rwy 21 and prevents a sudden drop of 60ft in the RA when passing over the cliff. The details can be seen in the Precision Approach Terrain Chart in
AD - Aerodromes - Navegacion Aerea - Aena.es - Spanish airports and airspace
I am now working abroad, but I will try to take some pictures next time I am over there.