RIP Arez & Booya
Actually, MK is a bad example in general, because the gameplay changes to practically unrecognizable extents in each new version. SF would be a decent example. While SF changes pretty drastically in a lot of ways, there's still a fundamental base it follows. That's what Tekken should be doing.It needs an overhaul because it's stale. It doesn't attract anybody but Tekken fans. Look at MKX and Xrd for examples on how to overhaul a game and still be recognizable as part of the series.