To be real, DO will not surpass BTC but there is room for both to do fabulously!
Any coin may surpass BTC it's just the matter of time. Being the original doesn't mean being an undisputed leader.
Exactly, bitcoin is only the first cryptocurrency to exit, but it will not be the main one for a long time, and more because of the current characteristics that define it, and I practically cease to be the reference for the new altcoin, and deeponion if it can be worth even more than bitcoin, but that requires time and adaptation.
Do you remember when the iPhones were out? I remember that it was the first digital smartphone i saw in my life, Some people till now adopted the name iPhone for smartphones even if it is an HTC or a Huawei, Because iPhone revolutionized the world when it came up, But This doesn't mean that Samsung or Sony aren't great, they share the mobile market altogether.
This is a small example that adapts for Crypto, Why bitcoin is famous and has a high value? because it's simply the first one, so it dominated the market alone for years, Now DeepOnion and others projects might just be like Sony and Samsung.