You know, in life, everything we do (and even things we don't do) can be carrying some risks and of course, possible rewards as the results as well. This is the reality we have to contend with especially in dealing with cryptocurrency. Nobody can be sure if 5 or 10 years from now Bitcoin can still be existing. However, in my own guesstimate, there is a big possibility that Bitcoin can last for a lifetime since this is the very design of cryptocurrency.

Now, having said the above, maybe what you are really concerned is the value of Bitcoin...whether it would be continue on surging up and will not be reverting back to where it started (as what some critics of Bitcoin are predicting). Well, as to value, you can be sure that since the supply is low and the demand is high, it would continue on increasing though there would always be bumps and humps along the way (the value can go down sometimes).

Lastly, it is prudent on your part to 'invest' what you can afford to lose (though we are not praying that we lost our money here) and this is the most important tip you have to bear in mind (this is true on any type of investment not just in cryptocurrency). Another thing is to spread your baskets into many eggs (or is it the other way around?) or in others word please diversify. However, if you are adventurous enough then you can stake as big as you may want...who knows Bitcoin can be that one instrument that can really revolutionize your financial lie.

Good luck!