I hated the reboot song. It was just the old lazy, whiny "Hollywood is out of ideas" crap that people have been saying for nearly as long as Hollywood has existed -- the perpetual recency fallacy that there's something new about Hollywood creating new versions of old stories, when in fact it's been doing so from the very beginning. (For instance, the most famous version of The Wizard of Oz, the Judy Garland film, was something like the eleventh film adaptation of the Oz series in just over three decades.) People were saying the same "There are too many remakes today" nonsense when the original Animaniacs was on two decades ago -- and they were saying it two decades before that, and two decades before that, and so on. The ironic thing about the complaints regarding Hollywood's "unoriginality" is how profoundly unoriginal the complaint itself is.
It's particularly preposterous and lacking in self-awareness coming from Animaniacs, whose entire core premise is an homage to the early black-and-white cartoons of the 1930s with a liberal dose of the Marx Brothers thrown in, and whose best character is an homage to Orson Welles. The whole show was rooted in nostalgia -- one segment was an extended pastiche of Goodfellas (a bizarre thing to do in a children's show), one revolved around an aging cartoon star reliving her glory days, one was an extended homage to the classic "chasing a baby through danger" formula used by '30s Popeye and Chuck Jones's Marc Antony/Pussyfoot cartoons, etc.
I suppose maybe they felt they had to put that song in to pre-empt the inevitable complaints they'd get from the audience. But I wish they'd mocked the attitude rather than playing it straight.