A few months have gone by since YouTube began testing its "One Channel" redesign in a private beta, after which Google allowed curious users to voluntarily opt in. But while some have been experiencing the next version of the site's design for awhile now, YouTube is about to make the transition mandatory. Starting June 5th, Google will flip the switch on the One Channel theme across the whole site. YouTube believes this is a good thing for all, as it's noticed a 20-percent page view increase on channels that have already opted in. For impatient folks who can't wait until next month, you can make your own One Channel now via the "opt in" link at the source below.