I tink it's already happend in Holland over a year ago or more. That's where the biggest market is with the smaller nights being 4000 capacity and the bigger events being up to 30,000 people. There's nothing the size of that in the UK so why would producers of the style change what they are doing completely to cater for the UK which is a small market compared to amsterdam.

Why would they want to risk loosing their dutch market just to gain a hold in the UK?

I recon they will produce two styles ie commercial and underground.