This is a Bitcoin forum and naturally we will want to see Bitcoin at the top and outlive all of us which is what I also want but the reality is that 2050 is in the next 23 to 24 years which is quite far and anything can happen before then. But for the foreseeable future I don't see any cryptocurrency that can rival Bitcoin, it's market cap and network are way beyond what any cryptocurrency can rival but we don't know in the far future maybe innovation make us see something bigger than Bitcoin.
I don't see why we should worry about a rival for Bitcoin, what we can worry is about Bitcoin losing it's value like dumping to $10 and not having the potential to recover again. If a rival somehow emerges inasmuch as it is competing with Bitcoin at the top then I wouldn't mind the competition. But for the cryptocurrencies that are available in the market now I don't think that they can come near Bitcoin.
I am a crypto investor, and bitcoin makes up a large portion of my portfolio. So, to be honest, I also hope that Bitcoin will always stay ahead and endure for a long time. However, the future is unpredictable, anything can happen, and competition can sometimes be a good thing. Because competition help eliminate what is weak and unworthy of surviving.
Yes, I agree that if new technologies are created that compete with bitcoin, we should not worry too much about it.
Besides, we do not need to worry too much about Bitcoin losing value without the possibility of recovery. Because it is a risk that is always present in any investment.