move to another assest
like what, dead people printed on pieces of paper? that sure sounds more stable long-term

see, when bitcoin reaches five digits it will be the thing that you sell other things for. you don't now say "if USD reaches 0.02btc, I'll sell all my USD and move to another asset", same way you won't consider your bitcoins as something you need to "sell" - they will be your currency.
Bitcoin, while a phenomenal break through, will not end up being the defacto standard of digital payments. Something better and more regulated will come along/get approved and take it's place. Diversity is key.
Bitcoin is more strictly regulated than any other medium of exchange on Earth. It is also fully capable of adapting to preempt competition, highly motivated to do so, and able to express all manner of diversity without compromising its design principles. No fiat currency system can ever offer permanent and total immunity to counterparty risk and to seizure, and so will never be able to compete with bitcoin.