Sure, suppose the ICO craze spreads even further. It carries the ETH price to a thousand bucks. Or several. Whatever. Something extreme.
What exactly have shifted? Will your BTC be worthless? No. Will the companies and services go away? No. Or consider the other way around, there is a new DAO and now it's worth fifty cents. BTC doesn't care.
For a something supposedly declared obsolete, altcoin shills sure have a fixation with Bitcoin...
That's a little like rabbis asking what's shifted with the whole Christianity thing. I'm not sure if they will be the new religion, but they're proselytising at a faster pace currently, and that's bad news for those of us who seek power above belief.