Not sure if this is another Government Quarter-esque red herring, but the news reports say that a licence has been granted for a massive Macau/Las Vegas style casino on the southern end of Obuda island on the Danube.
Its received huge news-wire coverage over the past few weeks.
Sziget is so important to the Hungarian economy, tourism, etc. I'm sure if this were to happen, then another site could be found. It would be a pity though as the current location is fantastic.