1. A new Sailor Moon anime makes sense. The original one was very different from the manga in many ways and the new anime is alot closer to the source. Its like FMA Brotherhood: An anime of a popular series that is more closer to the original source material.
2. Saint Seiya is still continuing, the manga restarted in 2006. Omega (like the only anime since the original) is a non canon spin-off of the original series basically GT.
3. Dragon Ball is only back to make money, since kids at the time when it came out are older and thus have more disposable income for nostalgia.
I was fine with Part 3 being a mini series, but having a movie before it even comes out.
To be fair, the new Salior Moon Anime pretty much make the characters flat uninteresting and everything. I'm not sure how the original Manga was like compared to the Anime. But the new Anime is kind of really bad, it's one of the reasons why it might have be best that they did what they did for Kai. Since I shutter to think about the QUALITY that would leak.
Also, I think the reason why Dragon Ball is back is because AT wants to do something with it again. He was always a creator that did things on a whim. So since he pretty much stopped doing dragon ball stuff for awhile he probably just got a spark for it again and started doing it.
He has always been a creator that rarely actually goes back to read the things he wrote. Hell, he even said that he actually didn't watch a lot of the anime and movies just because he didn't have a lot of time.