In the last 10 years the industry has changed a lot in terms of methods - but not much in terms of structure.
You still have the big boys employing dubious characters on minimum wage and working oblivious to current H&S regs.
You still have the franchisers - the vast majority of whom are only out to bleed you dry (Ian is one exception to this, and there are a few others).
You still have the sole trader outnumbering both of the above at least 1000:1 and working happily away - usually making a decent living.
You still have the entrepreneur who's passionate about his company and has a few vans on the road with some highly trained & well paid staff - - and while he'd love to take over the window cleaning world he knows that much more expansion will mean he's spreading himself too thin & quality will suffer, so the vast majority in this category will reach a comfortable limit & never exceed it for long.
10 years from now the tools may have improved, self cleaning glass that actually works may have been invented (I doubt it!), but honestly - I don't think there will be any major overhaul of the industry at all.