Personally, I don't see the value in power for running for most people. In its current form, they aren't actually power meters, but more of power estimators. Stryd doesn't measure direct force - It uses a barometer and an accelerometer and a bunch of formulas to estimate power -- sort of similar to the PowerPod. Even if it is within 5% accuracy, 5% from a 6 minute mile could be anywhere from a 5:42-6:18. That's a huge variance.

With cycling, you're pretty much doing the same movement over and over. Your cycling form doesn't change much over the course of a ride as your feet are clipped into your pedals and moving in a circular motion. A direct increase in power across the board will increase your speed.

With running, everyone's form is different. Foot strikes are different, gait is different. Heck, the difference in your form at mile 1 is significantly different than mile 20. For distance running, you're actually trying to minimize your power output over the course of the race. When you actually get tired and your form gets worse, you actually are using *more* power than for the same pace earlier in the race.

Weather can also play a larger effect on your overall run. If it's 90 deg out, your core temp is going to rise, you're going to sweat more and become dehydrated. You might be running the same pace and wattage as a cooler day, but your HR is going to be up and you're eventually going to slow. With cycling, you get the advantage of the wind produced by moving faster, plus you have water with you at all times. So while performance might decrease as well on the bike, it's not nearly as drastic as while running.

Will running power meters eventually catch on? Possibly. The running world has been focused on pace and hitting specific times for track intervals though and runners at all levels have been extremely successful. Since running itself is more based on times than place, and most races are consistent efforts than cruise, attack, cruise, sprint, cruise, sprint of many bike races I've seen, I'm just not sure how that power number really fits in to either racing or training. If your goal is to qualify for the Boston Marathon with a 3:05, then you better be able to run that 7 minute pace the entire race. Running with 280w isn't going to get you in.