CSX, the owner of the tracks south of DC, is currently expanding capacity on the line between DC & Richmond. A few projects have already been completed, a few are currently under construction, and a few more will occur in the future.
Once they are done, service will improve some. However to my knowledge none of the current improvements underway will permit running faster than 79 MPH, so the travel times won't decrease that much. But delays due to freight interference should decrease considerably.
As for the downtown Richmond station, it did reopen about 2 years ago. Then it was closed last year due to severe flooding in the area. I don't recall if the damage has been repaired enough for the station to reopen once again.