The main parking lots are staying the same at $14. With tax and tip the true cost of valet is about $19. And Disney did see valet parking rise as people used the valet trick to park close. The hotel parking lots, self or valet parking, were never intended as theme park parking. They were always intended for the resorts guests and ADRs.
I was told two weeks ago when I was there that they will go farther if the price increase doesn't reduce the usage. Hard closures are a real possibility. That means resort guests and confirmed ADRs only allowed in the resort parking lots. Hopefully not, but the twenty percent of folks who look to get around rules (the lots are posted for no theme park parking) always cause these sort of reactions.
People should also know that DVC will not have free valet now.