umm...has anyone heard of Uber?
cars are a pain in the ass and expensive
if you live in the burbs and beyond, it's a must. but if I lived in the city, I probably wouldn't have one
(although now I have kids...so that changes that stance a bit)
also you can take the water taxi from old town...and I think Georgetown
I bet when the new water front opens in SW the water taxi will go there too
Also I'm sure MGM grand will be running free shuttles from Union Station and DCA ...I'd bet on that!