I would guess that in a few years, unless things change for some reason, then WFP will become the norm, trad window cleaning will always be needed, not all work can be done with WFP.
I personally think that the only thing that will go will be ladders, I think it is inevitable, whether we like it or not at some point the regulations will squeeze us off ladders altogether.
WFP will continue to grow in popularity, you only have to see the direction this forum has taken; of course there are lots of Trad window cleaners on here, and questions do get asked, but WFP is more complicated, it is more involved, particularly with regards the equipment, poles, pumps, brushes, jets, hoses, systems, pricing, methods or work and so on and so forth.
As for price...what the hell is wrong with cleaning an acount for £8.00?? I do loads at that price and I'm earning more money now than I ever have in my life.
I don't do a single domestic account trad, they are 100% WFP and that includes bungalows...and one of those is only an £8.00 one!...hell one of them is only £6.00
I can't see the 'self cleaning glass' ever being a real problem, spiders will still live in the corners and lay eggs, flys will still crap on the windows, sills will still get dirty as will the rest of the frames.
It's real use is going to be on a commercial level, high rise offices with acres of glass and so on...
Squeaks is quite correct though, trad will never die...only ladders will
Ian