I will never understand why any bitcoiner would be fearful of ethereum or vice-versa. Is just 2 different blockchains with way many differences that makes them both valuable.
I'll explain it so you understand. The most significant promise of Bitcoin as a value store is that it's supply is limited - 21M bitcoins. Proliferation of alts breaks that promise. Now there are 21M bitocins, plus 90M ethereums, plus miriads of other cryptos.
Yeah, that's where you are wrong. That's like saying that other metals break the promise that gold is scarce.
Having other cryptos is a good thing, if you try to test or implement everything on BTC, the chances of breaking something are much higher. As Edan said, "Ethereum will be our testnet".
And also, 1 BTC = 1 BTC. That applies to everything.
There are plenty of paints in the world and every day more are created, that doesn't diminish the value of a Monet or a Picasso.