Fair point, but the fact that YouTube is in decline while the entire industry is growing is a major indication of bad times ahead for the platform. I'll be following up on the data on a monthly basis, so we'll see over time, but this combined with the sentiment by many in industry leads me to believe this is the beginning of the end for YouTube.
That is unless they make some major changes or Twitch screws up massively, both of which are certainly possibilities!