I don't know why anyone would be surprised at this potential development. It was a matter of when, not if.
The Dems have more or less shown what they thought about black people throughout the past 3-4 years, not counting the Clinton years and so on. We never were really a priority to them, just a useful political chess piece to use when convenient, only to be ignored outside of election years.
With the way the Dems lost the presidency and made no ground in the house and senate races, it's clear that they'll have to refocus their efforts on particular demographics, especially those with bigger numbers than black folks.
We were always on our own, whether people wanted to believe it or not. This time though, it will be clear and there will be no doubt about it.