It probably will but it doesn't matter. TB2 is still faster, so this means there will probably be a "thunderbolt to USB-C" hub in the near future.
Also, we still see more USB 2.0 stuff at the stores than we do USB 3.0, and that's something that is backwards compatible. I doubt USB-C will have much better luck, it'll be like thunderbolt where everything is priced higher to make up for the smaller audience. Then when it might start to pick up, we'll see USB-D, 4.0, etc. Nobody will give it any time to grow.
USB-C will see a much faster adoption rate than TB. It is USB after all and there is already another laptop computer out there with USB-C, the new Google chrome book thingie. It is a good solution for the average consumer.