I personally believe that bitcoin will likely outgrow a lot of assets for a long time into the future, but surely the steepness of the growth curve is going to continue to be less steep. The punchline in the end does not point to some other place in which we should put our money, so we just have to do what we can do, even if we happens to be new and/or early in our bitcoin accumulation journey.
I agree with you because there has yet no other assets that have physical or technical traits that can compete and win against Bitcoin in the present. In the future, I don't think any altcoins can be designed better than Bitcoin technically so there will be no Bitcoin killers.
Gold can not change its traits, and if any change occurs, it will only increase gold circulation and total supplies.
Altcoins as proven in many years can not compete with Bitcoin.
there is no digital asset that can compete bitcoin for now, but we can be sure it will be like this forever. life is unpredictable and the only thing constant in life is changes. there is a possibility that another thing may supersede bitcoin in the future just as bitcoin came into existent and superset gold. this new development may not be an altcoin but another form of technology. altcoin will forever be under bitcoin and can never do better than bitcoin