In the case of Twente airport in the Netherlands, even with the new features, there won't be much flights. It's in a very sparcely populated area of the Netherlands and Amsterdam and Dusseldorf are only an hour or two away.
Plus knowing the Dutch politics, the moment a big airplane lands there, they'll all go Greenpeace and cry about the noise the airport is making and find some ridiculous rule to abolish it. So this airport may not expand ever.
I can imagine similar situations for other small airports in other countries.
Besides added all General Aviation airports in Russia and the US would be a heap of work and in the case of Russia, they are quite lethal to presidents of other countries. Rather have sami spend his time on the implementation of the cargo feature.