bitcoin would be never replace by another crypto currency because bitcoin getting too much power and bitcoin adopting is very much high and we know that bitcoin increase its price too much faster than other currency.
I guess everybody is entitled to his own opinion even if it is such a narrow minded like yours. However the price increase is such a bad indicator. There were times where Bitcoin had bad years and also the increase of some altcoins are bigger then Bitcoins if you look at it percentage wise, so other currencies are much faster growing then bitcoin.
Technology is evolving at a tremendous rate and just as bitcoin suddenly appeared and caught our attention, so is the possibility that another coin might come up and replace bitcoin, but that can only be if such coin is able to beat everything that bitcoin stands for. At any rate, the way to see that won't be that bitcoin was replaced, but rather it was improved upon and given a new name.