From the beginning I thought this was worth studying, but I can't even begin to form an opinion until we know the details.
Such as - the DC destination. I've heard talk of GU campus (as far as the hospital) as well as M Street, somewhere, and K Street where it would (could) connect with the streetcar (someday).
In all these cases, the key question is: how does it get there, once it crosses the river? There's a lot of protected real estate on any of those routes.
So, I remain interested in seeing the results of this study.