It's very uncertain for an Altcoin to overcome Bitcoin.
Maybe there will be an altcoin to maybe compete with the attention that bitcoin is having, but it will still be bitcoin at the end. If there will be anything overtaking bitcoin, it will spun from another technology that has an edge over bitcoins. Some people on hearing about cryptocurrency may want to focus on other altcoin instead of bitcoin itself. Some have been lucky to profit, but some people have been discouraged after finding out that they have invested wrongly. If anybody is doubting what to invest in, they should invest in bitcoin.