No guarantee about future and existence of Bitcoin so no certain profit from our Bitcoin investment.
I'm not sure if I understood what you meant by this, but it seems you already know something that some of us don't. AFAIK, Bitcoin was developed in 2009, and counting down to this day, it has existed for about 16 years and still counting. It has built trust and earned its place in the financial system of every economy. You know what, I feel, saying that the future of Bitcoin is not guaranteed is like saying that the future of Internet is not guaranteed as well.
If you've read a book like "The Internet of money" by Andreas(a very prominent Bitcoin enthusiast). He pointed out how people struggled to believe the implementation of things like the internet, vehicles, etc. They couldn't picture that these things would exist for long.
I don't think the future of Bitcoin is something to be scared of.
Bitcoin has built trust and earned its place. Don't picture a short term existence... There is more to come.
There is always uncertainty in everything we do, including our investment, with probability of profit and loss.
There is always uncertainty, but not at all times.
When you say "in everything we do", I assume that to be a wrong generalization.
Good management is helpful for reducing risk while increasing chance of success but there is no management that can completely eliminate risk.
Period,
But I wouldn't want to start assuming that the future isn't guaranteed. Bitcoin has proven itself, and we all know that a long term plan reduces your risk and gives a better profit. I might start having a second thought about that when someone can prove otherwise to me.