Dislodging Bitcoin is a difficult task but not unachievable. There have been a lot of other alt currencies (litecoin, etc) that have been popping up, but don't seem to have what Bitcoin does. I think down the road potentially, it may replaced bitcoin. Although, we must not forget that it’s been just a few years since the bitcoin came into existence and there’s still a long way to go.
The majority of the people are simple users. With simple users I mean that they don't need all kinds of altcoin features that don't see any real world usage. People just want to earn money, spend money, and invest money. Bitcoin serves people very well in that case. Only negative aspect that Bitcoin has right now is that it cost so much in order to send transactions. Especially when the network is getting spammed with transactions as happened just now.
