Ask yourself this; what problem does dogecoin solve?
Ask yourself this; what problem does Bitcoin solve that Dogecoin does not?
I'm bullish BTC long-term but I recently bought some DOGE cos I like em and think they're funny. Perhaps the joke will get old and people will walk away, but people thought Bitcoin was a joke in 2011, and it's still here. Gode also have a way stronger community than BTC, less full of trolls and jaded types. They also have a decent dev community - though not as adept as Bitcoin's.
I can answer that quickly...
Dogecoin will never be more than a joke. It was designed as a joke, launched as a joke, and based off of a joke. Bitcoin isn't a joke to me and countless others... It's actually something I feel worthwhile; something bigger than just another form of fiat. Bitcoin has the support of my core ideology.
The same psychology that drives people to Dogecoin is driving me to Bitcoin and Litecoin; unlike Dogecoin though, Bitcoin isn't just a joke... Litecoin has my attention primarily as a hedge just in case there is a flaw in Bitcoin some day; I like the scrypt mining too. Litecoin was also developed with the same ideology within its user base.
Ask anybody who suffers from the unilateral decision to empty their bank accounts or bail-in their central banks about how funny that is. This isn't a joke to people who have been under the magnifying glass...