Nope. Being a one-hit wonder can have it's positives (though I'm not sure if he got another Top 40 on Billboard). In any case, this is the positive. Most people will always remember the "Fireflies"s, "Bad Day"s, "You're Beautiful"s, etc.
(That number was enhanced by Amazon MP3's decision to sell the set for 99-cents for two days during its first week. Billboard has estimated that Amazon MP3's 99-cent version resulted in 440,000 copies sold.)