I'm sure you already know this, but suffice to say that Bitcoin is in a world of its own and will continue to be the catalyst for the growth of altcoins. Should altcoins die off, BTC will still survive IMHO even though it will see a lot apathy like we're experiencing with the bear market condition. Already at this stage, Bitcoin can exist without Altcoins and Altcoins can exist without Bitcoin. Cryptocurrency is already quite strong, many people already know about it, so I think that the point of no return has long been passed.