Amazing how CNBC and other news outlets are being particularly arrogant lately, must be the affects of the election that they think they can just run around screaming at people they're wrong and telling them how to do everything.
I checked out of curiosity, seems like their block explorer is full of mining and poloniex txs... so I don't think they are taking any load from BTC. Actually it wouldn't make any sense to do so as LTC, DASH and DOGE have more widespread adoption than ETH - they are the primary candidates for taking more txs.
Speculation and mining are the main economic activity of all coins, including BTC. A growth-capped BTC is good for all alts, I'm sure your DASH will have its day in the sun too. No need for concern, just keep supporting Blockstream, it'll happen.
But in bitcoin you can invest in a ponzi of every kind. You know, fun money.