I think it's too much. Bitcoin may not remain on top forever because there's a chance that it will lose its value by 2140. That's the estimated time for the last bitcoin being mined which means people might lose interest to it and shift to the next big thing. Well it's almost a forever tho lol, I guess it now depends on the point of view of the person . But one thing is for sure, btc will be the king 'til the end of this generation's lifetime .