The US (and the world in general, really) has a lot of open land. We're in no danger of reaching "peak landfill" anytime soon, and if/when we do, it will probably be feasible and cheaper to lift and launch waste into the sun instead of trying to recycle it.
Nice one, hadn't seen that particular article about the problem before. A hidden underlying detail in my comment is an assumption that such a waste crisis is so far in the future that we'll have things like space elevators (making getting to orbit easy) and solar sails (making reducing the starting earth-to-sun relative velocity doable in less than a year), though.
