I do see what the OP says, the fact that the charts are quite similar looking but valuation is completely different story.  We should also remember that traditional altcoins typically follow the rise and drop of Bitcoin as well so that is one possible explanation.  I think it is also important to remember there was a time when people exchanged Dogecoin for Bitcoin and vice versa.  It just so happens that Bitcoin was the first and more widely adopted.  I do think Dogecoin does have a long-term future and will be resilient because of the great community of people who continue to use it and not so-much investors.  I think that is the main difference between the two coins.  Do I think Dogecoin will ever catch Bitcoin though?  Definitely not, but I wouldn't count out Dogecoin as long as the devteam continues to support and market it better.