It always cracks me up how these threads about how well WotC and D&D are doing inevitably get hijacked by a few folks who always foresee doom-and-gloom.
It's like looking out at a sunny day and saying, "If this continues, it will never rain again!" or "It's sunny today, which means it will be rainy and stormy tomorrow."
D&D is doing well. WotC is doing well. Our hobby is thriving, and there are more ways to play than ever before.
I see this reflected in my own experience of playing D&D. I have more access to friends who play and ways to play. I just had a baby, but I don't have to leave my group when it's my night to take care of him because we play online! We might be moving soon, but I know I'll be able to find people who play D&D wherever we go (unless it's Uganda, which is a possibility).
I'm excited to see where D&D goes next. If it doesn't fit my current D&D mood, I know I can be patient and it'll swing back around. 3.5 and 4e didn't fit my D&D mood, and 5e does. Maybe 5.5 or 6th won't, but I can keep on playing what I like to play.