Give all the pros Garmin 200's; Speed, time, distance, elevation gain, calories, max speed, and average speed. That's all you need during the race.

Go ahead and use the powermeters for training and in testing your efforts. But there really isn't a
need for it during the race.
I would much rather see cyclists racing according to their heart then their screens. Or as Bernard Hinault says "as long as I breath, I attack."
Cyclists shouldn't be looking down at their screens and think "already pushing 350 watts, better hold this pace or I'll tire myself out" they should be thinking "getting tired, but I didn't get into this sport to ride at tempo and come into the finish with everyone else like on a casual group ride! I'm going to attack and make something happen here! It won't kill me."
Cycling holds it's roots in the epic rides the riders of the past embarked on, guys like Merckx, Hinault, Kelly, Gaul, etc. These guys didn't think about whether they might overdo it, or go out too hard on a attack, or the risk of the attack not working out. They just did it and hoped for the best.
They raced according to their heart, not their screen.