DC had every opportunity to keep the area relevant after the massive boost it received from the arena being there. I worked in Chinatown for 7 years, watched it first hand year after year. I've seen the hardball played with the cool new restaurants as they were evicted and had to run to Shaw, Barracks Row, etc. and chains survived to shovel $28 guac at folks.
This is simply deserved. DC residents can cry and whine about it all they want, it's just sour grapes. Maybe it'll teach them a lesson about not dropping all investment after an area gets a boost from development. You have all these great examples with Union Market, H Street, the Wharf, everything around Nats Stadium, etc. Jumpstart investments and continued support. Ownership complained for YEARS about the lack of investment, only to be ignored. You're not just entitled to tax revenue for no reason. Yeesh.
Also the "oh no it's 20 more minutes via Metro" is absolutely laughable, and is simple "DC isn't the DMV" snobbery. FedEx is a million times less convenient, Old Town is a wonderful area, DCA is maybe the best airport in the country. This is not some "so far away from DC it ruins everything" situation for a pro team most folks will visit a few times a year.