The problem, WoW, is that those games have seen their core audience shrink year after year since the late PS1 / early PS2 days, to the point where games like Tekken no longer sell 6-7 million, but 1-2 million, games like VF no longer sell 2-3 million but struggle to sell 800k, and games like Street Fighter, once a king in the industry, are niche products.
And in the meantime, SSB has done nothing but get bigger and bigger with each passing generation. So you're absolutely correct, Street Fighter should not change -- if it's willing to die a slow death while Smash and other games of the new ilk grow ever more popular.
I'm not saying you're necessarily wrong, by the way. Here's the central question: is it better to play it safe and milk something like Tekken, knowing it will be a dead property in 5-10 years? Or is it better to risk alienating the remaining core fans in attempt to revitalize a dying genre? There isn't a correct answer to that one until we're 10 years down the road and can look back and see.
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