Dance parade being cancelled? Not due lack of animo, but strictly cause of a more strict policy towards public events. It could have been the bloemencorso as well..
Festivals terrorized by hooligans? Incidents..
Lowlands stopped programming house? Basement Jaxx, Audion, Dixon, Koze, Dekmantel, I-F, Joost van Bellen, Optimo, Tiga all in last years line-up. And then I'm not even including all techno and IDM acts..
I must say I don't recognize any of the points OP is presenting as a tendency of the donwfall of popular electronic dance music. Quit the contrary, it's still as popular as it was 5 years ago. Maybe even more, dance is more then ever common ground on a global scale. The commercialized clubculture is still expanding, pumping the shallow beats till morning glory with DJ's as leading cashdriven popstars. The freaks have already left the building, only to practise their skills on DJ-hero. Meanwhile Bobby from the block is having a blast, and even aunt Annie can't wait for the upcoming Sensation.
Dance has had many faces over the years, and has proven to be a substantial part of mainstream culture. Still zillions of parties every weekend, more dance then popfestivals, electrohouse and minimal are big as shit. When you here minimal tunes in the H&M and department stores, you know it's still high on the list of the marketing goeroes. If you use the charts or MTV to pull conclusions on mainstream music in general, I can imagine the 'death of dance' idea. But these references are far from reality, nobody buys singles anymore, MTV lost the M five years ago..
All though I do agree that dance is dead, but that's out of a musical perspective. Innovation is long gone, all has been done. Nothing wrong with brushing up forgotten genres, but now we've come to a point where the whole circle has been used in many ways. Especially 2009 was a very bad year for techno and electro, and I don't see that getting better in 2010. Disco died, house came. But disco was only one genre, house split itself up in dozens. That's another reason it won't be going anywhere. Enough to choose from for everybody, a whole new generation has already begun their invation. Even hardcore is still going strong, only the italo lover sobs itself everynight to sleep..
It just is..