The problem....rather a problem (there are many) with NASA is that it's old and senile. It's been hammered on by the Iron Law of Institutions the Iron Law of Bureacracy and possibly Rat Utopia. Not only that but from watching this year's election the US Government as a whole is in serious decline. It's growing senile.

So don't count on NASA for much.

Rather look to private enterprise such as SpaceX.
Boeing. ...
Orbital Sciences. ...
Sierra Nevada Corporation. ...
Virgin Galactic. ...
XCOR Aerospace. ...
Made in Space. ...
Ad Astra Rocket Company.

and several more...

The best thing that NASA can do is get out of the way. Just sit by the fire, have a cup of tea, pull it's shawl around it self and dream of days gone by when it mattered.