10% is not enough to be noticeable for most people. Certainly close enough to make other attributes more of a factor in which platform you choose. In my experience AMD hardware ages quite well. If as I suspect software is only going to become more multithreaded Ryzen should stay competitive.
The best news to come out of all of this is the consumer now has a choice.
Price is an attribute too. Now you get a decent cooler with amd which you can do a bit of an overclock on. Intel you get a stock cooler which you can't overclock so you're out another 30-40quid on top of the cost of the cpu, which then points to an additional £50 or more to go the Intel route. Some people have a budget they need to stick to and an extra 50 quid is a deal breaker for some. That 50 could be a decent SSD or for something else in their build. Perhaps the £50 means they can afford a 1070 card over a 1060.