What do you mean its electorate is expected to look a lot different in the coming years? Race demographics wise?

About the only thing that has substantially changed over the years since day the 70’s has been the black population. It’s gone down towards a bit low than 50% as of 2020 compare to 1970 when it was at 71% per the Census.

All other demographics have increased in population over the years. This may have to do with cost of living in the city but I don’t know for sure. It’s not unique to DC though as cities like Oakland and San Francisco have also seen their black population population shrink over the years

However, while DC has seen its black population shrink since the 70’s, for the first time in it’s presidential election voting history beginning in 2008 for Barack Obama it began to vote for the Democratic Presidential Candidate in the 90% mark. Since then, no Democratic Presidential Candidate has gotten lower than 90.2% of the votes in DC. In fact, back last year Trump got 6.47% of the votes, down from McCain in 2008 and Romney in 2012.

I wouldn’t sweat over DC’s demographics over voting at the presidential level.