Now, it seems to me that if it's uneconomic to recycle something now (and it must be, or they'd be paying to get the waste) it may not always be so. So landfills of today may be the goldmines of tomorrow. And if we send them to China or the 3rd world, they'll have the goldmines and we'll still have holes in the ground. However, EU rules trump all. As soon as something becomes 'waste' it is subject to all the tyrannical practices of the Euvil regime. So, my plan is that it shall never be categorised as waste. It will be, say, 'heritage mix' (other suggestions welcome) and will be held for the benefit of future generations in specially-allocated storage facilities. If they look like holes in the ground, that is merely a coincidence.
I keep saying, the basic mistake was to call it "landfill" in the first place. It should have been called "land recycling", which it often is. Just up the road from us, we have an old corporation tip, which filled in a shallow, unusable quarry. After many years, it is now a development site for a new industrial estate. So what are they going to do with all the holes now?