I didn't notice they had stopped doing them, but I suppose with the advent of fast broadband and good quality online video in most homes of their target market, then less use for thse, and extremely expensive to update - which they would have to do quite a bit updating of with the new fantasyland coming, and closure of other rides/attrcations elsewhere.
Perhaps thats it? Perhaps they are waiting until they can add new footage of the new fanstasyland before investing in new production?
Also they tend to do a lot more UK TV Advertising than they ever used to (I spot adverts at least a couple of times a night) , so perhaps the money is being spent on that, and proving more effective in gaining bookings