EVERY FIVE YEARS.
Do you like 80's anime? Have you ever enjoyed F-Zero?
This.I sense a small upsurge in this kind of thing over the next few years. People have nostalgia for that ridiculous "dark and edgy" style.
With the massive amounts of time (7 years?)and resources (nearly every Japanese animator of note) that have gone into
Red Line, I highly doubt this'll become the norm.
For those interested, you might want to check out
Trava - Fist Planet, which is a kind of prequel.