Creedence was also the first thing I thought when I saw CCR.
To be fair on LOVM, they were trying to cram about 180 hours of original content into the animated series. It just wasn't realistic to do it in one season. But I do get the feelings, don't really disagree about the feeling of being tired of it.
The storyline that will be represented in season 4 was actually pretty quick in the original content, about 60 hours (using average lengths). But it built upon a number of small little things that had come up here and there through previous storylines. So I'd hope that if they choose to get it all into a single season, they could. (It's worth specifying too that the upcoming storyline was the final one from the original show.)