I don't know about soon, but anything is possible in cryptoworld. Not a single altcoin has been able to take the number 2 spot and now that asics are out for scrypt, LTC offers nothing special over just investing in BTC. DRK is at least innovative, but we have to get to and maintain a 50 million dollar market cap first before even thinking about anything higher.
if you look at the total amount of coins that will be created dark is quite close to litecoin
You can't just extrapolate like that though. If that's the case, a super scarce coin like 42 should be worth major market cap but it isn't. I do agree that DRK has major potential, but before anyone starts >LTC in terms of marketcap, lets actually make it into the top 3. If it's strictly based on price (> LTC's price), then sure, as current supply of DRK and LTC price would be around the $50M market cap.