We just had a filler and there's probably plenty more to come, as the Rocket Vs. Plasma eps will probably air in the next few months and there are 2 or 3 months between then and the Movie.
So what's going to happen between then? A filler saga is likely. Maybe if we're lucky we'll get to see episodes featuring Black City/White Forest, but probably not.
This would of left enough time for a nice long League, as it's not like BW will end in two months, like the end of DP did. So what was the point in rushing the League?