[doikor]

I think we do have the technology. Just not the budget it would take to do in near future with the technology available. To make it economically feasible is going to take some time.

If US put the same kind of money into NASA they did during the Apollo days (so 4% of federal budged instead of 0.5% for a decade or two without changing the plan/goal of NASA with every administration change) a lot of stuff would be possible.

If you had an "infinite" budged you could just build a VERY big space craft in orbit and use that. But the money isn't there so it isn't happening until SpaceX or whoever lowers the launch prices further (SpaceX Falcon Heavy and/or ITS/MCT for example)