As an aside, what a shame it is that the combined vision that 2001 Director Stanley Kubrick and author Arthur C. Clarke had of the future development of spaceflight has never come to pass.
If the US had just kept turning out those Saturn 5 rockets, then there would surely be a permanent Moonbase by now, and the Moon itself might even be the 51st state.
As it is, Chinese or Indians are odds-on to be the next humans on the Moon - and good luck to them, if their governments have the cojones and vision to get on with it.