All of the examples that you cite are speculative in nature and to be a successful speculator you need to know when to exit. For example, personal computer companies were a great bet in the mid 90s but a terrible bet in the 2000s.
So my question to you is how will you know when it's time to sell cryptocurrencies? Is there a particular methodology that you're using?
Well the answer is that I underperform what could have been optimal. That means I sold most of my bitcoins between $200 and $1000 USD. Sure it hurts, but I still have some.
I got out of the stock market in 2006 because I thought it was overpriced too. I'm the type of person that looks at fundamentals / physics and I get in and out early. Bitcoin might be going to $50k a coin, but I bought at $3 USD and I still have a small amount. I still think the governments are going to ban it, but having a bit of exposure is averaging the risk.
I believe your assessment of "government ban" is a good bet. People forget that governments always want to control the money; I believe they'll let bitcoin go for a while to gain national acceptance - and then outlaw it in favor of a self created currency. Then, since having all money be digital and tracked is useful to a govt, they'll introduce a country wide one.
Why do you think it’ll make it as far as governments banning it? I suppose it depends on whether it’s a reaction to laundering or tax losses, with the former meriting attention a lot sooner than the latter.
So my question to you is how will you know when it's time to sell cryptocurrencies? Is there a particular methodology that you're using?