No idea. It probably won't happen until 2037 at the earliest, maybe 2041.
2017-2025: Clinton
2025-2033: Clinton's VP, perhaps Castro
2033-2037 or 2041: Republican
2037 or 2041: white male Democrat
Do you actually think there will be Democratic rule for 24 years?
At the moment, yes. The GOP has fallen apart, not just structurally and organizationally, but on policy. In 2012 people thought the party would have its act together by now and its only gotten worse. Dems probably won't have control of Congress for a long time, but the White House might be ours for years to come.
