I don't think any coin can surpass bitcoin because bitcoin is so popular and growing everyday. I don't see why there should be another coin that will go as high as bitcoin. So bitcoin will be at the top and stay at the top.
well i think only the time can say that because it is now really too early to predict that bitcoin cant be replace by another coin.nobody knows on this feild everybody is just only guesing .and no one can assure of it .because all kind of saying about bitcoin is not really sure everything is just a prefiction.
Bitcoin can be replaced by another cryptocurrency because there is a lot of good developers around the world and if they will create a good coin that has a lot of advanced and better features than the most of the cryptocurrency in the market then it will have a higher chance to survive in the market and attract investor that will boost the price and will result for getting more attention because of the price surges.