We know what technology we need to build. Why must we wait a full two more years for a report to get finished before even beginning funding proposals on which path to pursue, before beginning any construction or engineering?!
None of us are getting any younger. I know this is complicated technology to build, but contrast how fast technology moves in the valley compared to this, and you can see the ways in which NASA could really use a bit of startup hustle... (like back in the 60's, when NASA engineered and landed people to the moon within a decade.) There just appears to be no sense of urgency at all.