more like 25 years of neverending rehashes...
but at least it still got progress(SF1 to 2 to 3, and then the Alpha, EX, and finally we're stuck at SFIV), unlike Darkstalkers, they seem to show that they care about it by adding the characters into crossover games over and over again, but they only ever released one game on one engine(with several rehashes and a lot of repackaging)