If we talk about present and not so distant future. There is no cryptocurrency which has chances against bitcoin. Bitcoin has the first mover advantage. Therefore it will keep its first position safe for some time. But I shy away from absolutes. There is a complete chance of an altcoin surpassing bitcoin surely not in coming future but yeah someday.
There is a possibility and perhaps some Altcoins was dumping on purpose so bitcoin will get the heights he deserves, but if they would have a chance to get the top spot of the food chain I think he will not think twice to take it, my opinion is Altcoin can surely do it, but the price of bitcoin today was incredible and a mere altcoin can not handle the heat of the increasing value of bitcoin that is nearing to $1600 as of now the total value is $1576.93 on the google converter!