Speed isn't the only measurement of an M car. It's not just a standard 3 series with a faster engine. An E46 M3 is a memorable all around driving experience while the e9x 335 (to use your analogy) will be find its place in the dustbin of history.
Every M iteration provides a driving experience that future non M generations will never poses.
Sure it's possible a future standard 3 series will be faster then a current F8x, but at the same time there will be an M version drawing the enthusiasts too it that much faster.
Your argument is like saying today's VW golf or Ford Focus is faster then yesterday Porsche so why by a Porsche?
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