Well, yes and no. Think of each coin as a unique technology. BTC has it's own technology structure. Moving to another coin is like moving to another stock. Sure, it might be better or worse but the business model of AAPL is not the same as the business model for IBM. But yeah, they are both stocks. The Feds could basically buy up the BTC just to destroy it. At a bare minimum to control it and round and round we go....
Most are only interested in the speculative aspect. Now the consensus is that bitcoin is best... and most supported by miners and marketers. But when bitcoin isn't around... they will move to the next because the speculative nature is the same.... underlying tech might be slightly different, but most are very similar. Maybe Ethereum is different, since that is targeted to contracts and info on blockchain... not only currency.
That's why I don't believe in it, people are holding because it's going up.... that's speculating... If it would be used for transactions in the goods and services sense, it would make sense to me. And if it was truly limited... or better: unlimited but dosed release.
I'm going to an info-evening in my town tomorrow, curious to see what people is attracted and what the general arguments are. Pretty sure the focus will be on that it's easy to create wealth since it's only going up, besides a few crashes of course... If I don't get the "I-want-to-get-rich-quick"-vibe of the crowd I will be surprised...

