That's a very unpopular opinion among people who cannot afford guarded and gated communities, and Sidwell Friends for their children. It may be a correct opinion but unpopular.
I say moved the jobs. Break up the federal government, at least to other parts of the US, before DC looks like Trantor (from the Foundation series).
The jobs are decentralizing, at least in terms of the metro area. A lot of the job growth is in the growing suburban job hubs. Tyson's is the biggest, but there are smaller versions all over the area. From a strategic standpoint -- given that DC itself is already fully built out -- the biggest transportation issue is whether the large suburban jurisdictions will plan for mixed use development with multi-modal transit options, or repeat the folly of basing all planning on the assumption that everyone will drive everywhere. Going forward, it's important that the outer ring suburbs not repeat the mistakes DC made 50 years ago. Right now, it's a mix.
As to the schools: DCPS revenues per student are just under $30,000 per year. That is the highest figure in the country. That's not quite Sidwell tuition, but it's higher than the cost for most of the private schools, including all but a couple of the Catholic schools. Voucher the system, and high quality private schooling would be affordable for every middle class family. Yes, it would take time to build the additional capacity, so the sooner we start, the better.
What really needs to be decentralized are the big concentrations of poor people. How to do that is the hard question.