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Dogecoin has a strong community that's for sure
Ok so merge-mining is a plus point... If I am correct this means that
You believe: People want Dogecoin, and mining LTC is an added bonus.
Maybe the world believes: Dogecoin is a bonus system for mining LTC so while it's around I will mine LTC through Dogecoin until it is worth shit.
If the second applies Dogecoin will forever be bound to the LTC and breaking loose will be a problem.
Dogecoin is not bound to litecoin, it is only bound to the scrypt algorithm and offers opportunity to any major coin mining the scrypt algorithm. A better way of looking at it is- every smart pool that mines for BTC, also mines for namecoin. Why? They have nothing to lose and gain a little extra.
The same applies for mining Dogecoin while mining for litecoin.
One important note that (that favors Dogecoin) is that, if Dogecoin ever supercedes litecoin, litecoins hashrate can fall and it can die out. This can never happen to Dogecoin as long as there are scrypt miners (as anyone mining script can also try to solve Dogecoin's block and thereby also be mining Doge, increasing its hashrate and securing its network)
All the scrypt coins are slowly fading away. I will be surprise if litecoin or doge coin can keep the top market cap chart in 12 months.