I don't want to call out the PPG fandom as being ingrates, but considering that the TTG show pretty much openly tries to screw with those who take TT '03 seriously, the PPG fandom has it sooo much better than they think. I look at the PPG show and at least they're trying. The show says to me "we grew up on Powerpuff Girls and loved it too. We want to be your friends!" while TTG says "Yeah? You hate us? Well we don't need you since the kids who actually watch us have never seen an episode of the original and aren't butthurt about it."
Like I said before, I can't even call PPG a Reboot so much as a very long uncancellation. And when shows get uncancelled, the fans that were screaming the loudest for it often regretted it. Then again, I still feel the show's being compared to second-fifth season PPG where the show took off and became something. Comparitively to season one, it's just slightly not as good, but compared to the weakest bits of season 5 and 90% of season 6, it's some grade A stuff.
This crossover could be decent. I can see them writing the PPG better than the Titans usually are, and Mojo's the villain and gets a song apparently. I like seeing more CN crossovers are happening since "Say Uncle" and the Grampies. And even the "Regular Time Adventure Show" promotions.