Bitcoin will always have a brighter future compared to altcoins and that's for sure. But there is no sure way what will be its price in the next years as bitcoin is highly volatile and keeps fluctuating its price. Its bears and bull cycle will never stop so the price will not settle in a single trend, it will move certainly to its upward and downward position. But if we are aiming for higher profits in the future, then we should learn to take advantage every bearish season comes and buy bitcoin as much as you can. Because one thing for sure, bitcoin price is always aiming for an upward trend, although there might be price corrections but they are just for temporary and sooner the price will bounce up again. So its always a good preparation and certainly an edge if you can hold bitcoin as early as now.
I do believe that we could definitely see the other altcoins have a brighter future as in have a bigger increase. I just do not believe that they would ever be as big as bitcoin and go as long as bitcoin can. This is why most of my investment is in bitcoin, and the rest is in other coins distributed so none of them gets closer to bitcoin. Just because we believe in bitcoin and love it, doesn't mean that we should shun other coins neither, we should promote them as well.
There are some memecoins and shitcoins that I would understand if you do not want to promote, I do not neither, but it is wrong to think "only bitcoin will survive" neither, that is not healthy look at crypto market.