Because this time around, it's actually good!
I've always followed, looking at the screencaps from Serebii, and then checking the character bios. But I dropped off in Gen 3 cos it got repetitive and boring. Granted, they're probably better than I give them credit for, but seriously, Gen 3 was a trainwreck. Gen IV was a bit better, but I wasn't interested.
Then Gen V came in. I was appalled at some of the changes, both to the game and to the anime. But I learned to love Gen V shortly before it's release (B/W. It's now my favorite gen.) This didn't sway me to actually watch the anime though. What got me was, after looking at the screen caps, the Pokemon, and kind of finding out what's going on, I noticed it was really starting to get interesting. So I looked up and streamed it online (I did this with every gen) and this time around, I wasn't in a hurry to finish. To be honest, I was upset that America had just finished the Lenora segment, since Japan had a lot of cool stuff going on.
I live in Japan, but I'm American (long story) and I live in the American part of Japan (long story). But I grew up watching the original, raw episodes in Japanese, so I decided that it really was worth it. The episodes are so good, hardly making use of fillers. And even the fillers are pretty interesting. And the tournaments; those are the best. I think it's awesome that they're doing that.
So tl:dr, I started watching again (cos I did give up) because they really made a turn for the better this gen. They took all the things that made Gen 1 good, and took it on a different spin, as opposed to previous generations where they just added more of the same thing. It's new, it's fresh, it's actually interesting now.