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Nothing to stop power meters being used in training or recording ride data, just shouldn't be available to athletes in race as it's getting to a point it completely determines their tactics rather than having to rely and trust their own physical instincts.
It opens up an interesting question as to how many tours would a rider like Froome win if he didn't have that visual, technological feedback staring him in the face? It seems natural that races would be far more open and attacking if riders went on their own legs and the terrain and that would make cycling a far bigger win for sponsors.
Problem is, like with all tech, disc brakes for example, the sponsors/bike suppliers want their products in the shop window, so any move to stop the pros using power-meters will be blocked. Race radios are another matter, unless it's the Next Big Thing for the MAMILs, so they can chat to their wife about what they want for lunch while on their Sunday morning 20 miler.