Not all people are aware that airless tires are already being used by the military. This new technology had been tested in various terrains. All objections that are being raised by critics had actually been addressed by the manufacturer before the technology was introduced. The military by far is the most stringent critic of new technologies being introduced. They are the users of the latest or what we usually call as state of the art, and they prove the worth of the things they use before these things are available for consumption by the general public.
Since airless tires are already available to the military we can expect that it will be available for commercial use very soon.