PS4 does not have to be added to PSV to be successful. PS4 is selling more than 15M per year and is at 57% market share. If that's not a success then NES isn't either. And I think NES was a tremendous success.
Nah, Turkish and others here have made it clear that it's fine to just mush all the numbers together. A mere 150 million PS4 sales would represent stagnation for Sony's install base since last gen.