The question is very much arguable; many will present their facts and reasons for why they chose the answer they chose. Currently there is no asset that has proven to be competitive with Bitcoin, so we can say that Bitcoin will sit on that throne for a long period of time.
But we are in the era of change, where new impressive innovations are welcomed and accepted. If in the near future there is ever going to be a new asset that will fill in the gap that many consider to be very important, then there will be a shift in choice, but that's not going to happen anytime soon, not even in the next few decades, but in the near future we should be ready to accept change.
Yes, bitcoin is probably on the top of other assets these days, and it will remain on its position as long as there’s no asset that will beat its position. However, changes are inevitable, and every changes comes with new challenges, and that includes for bitcoin.
Maybe a new asset will be introduced much better when it comes to bitcoin’s positive features, so expect that these people who invested into bitcoin will shift into the newest investment and stick to it, thus losing the demand from bitcoin. This is just a simple prediction, but it’s always possible to happen.