Here are some news from the first weeks of BFA:
You see that spike up of the red and spike down of the blue near the right edge of the chart? That's leveling characters.
You can see from the rest of the chart how it generally was before: two lines close to each other, with the Alliance line typically slightly above the Horde line. It was the same in the past: two lines mostly close to each other with the Alliance line generally being above the Horde line. This was the case in both expansions favoring (speaking of PVE and/or PVP) the Alliance and in expansions favoring the Horde. The reasoning always was that yeah, racials are not balanced very well, but that only affects top levels of PVE and PVP and the rest of the game is healthy enough to attract many new players and these new players choose the Alliance a bit more often than the Horde.
Well, this is now gone. For the first time, the Horde dominates general activity levels. Which at this moment consists mostly of people leveling characters in BFA. And what a dominance this is: there are 2 leveling Hordies for each leveling Alliance.
WoW is de-facto becoming a game with a single real player faction. This is happening right now and we just witnessed a major turn. The next turn is going to happen with Uldir which the Horde will clear earlier than the Alliance and it is only a question of how much earlier. 1 reset? 2? Maybe 4? We'll see...
Blizzard, if you aren't fine with the game having just one real player faction and want to keep two of them, make all PVE and PVP activities faction-neutral. Allow cross-faction groups for everything.