I think the same.
Altcoin to me is just a way to multiply my bitcoins, sometimes all my bitcoins are invested in a few altcoins but in the end i sell all of them for more bitcoins.
I do not think that bitcoin will ever leave the market. Here are other new currencies that will disappear, because no one will get such effect as bitcoin. there will be a competition for bitcoin, so you shouldn't rest easy knowing that any day, the coin that could equal bitcoin may rise.