Do you see any possible scenario within the upcoming years where BTC 'll collapse, and the other cryptos which actually have use cases 'll take away the marketcap of it?
I don't think so, at least in the next five or so. Possible later or at least, it will become less important for the market.
Look at diamond's price, its going down for a decade.
This is not a good example, as diamonds are not rare at all and everyone knows they have a monopolistic supply constrained by De Beers. There is a very good reason it isn't listed as a commodity.
I don't think dethroning is the endgoal, it is just that there will be so many chains and tokens that bring value in various ways, just like business today.
I used diamond as an example, because within my eyes both has the same actual value: nothing. I don't like bitcoin thats a fact, but there is a reason, the ecological footprint of it is too high, it should not even exist while the energy used by the whole system could power up a country, and it doesn't rly matter if it's green or not green energy. It's a waste, while there are many options for sustainable solutions.
Dethroning is not the goal, but dethronement will happen when it's not so important for the market anymore.