I don't enjoy his music (I tend to prefer live instrumentation), but good for him.
He found a niche and exploited it; he also worked his ass off all year. He's smart with marketing and clearly motivated and determined.
It's a fad (albeit a popular one) like most genres.. he should cash in while he can.
Your view of this kind of music as a "fad" is probably how people overseas view country music in america......