I personally am not so sure about the bitcoin situation that will no longer be valuable because the state of bitcoin is declining continuously
Price is not state, the prospects and underlying blockchain network is not dictated purely by the price and headline interest. All the while price goes up or down they must successfully develop the protocol and bring the situation forward. Even if price was going up, if the proper advancement was not occurring it would not be bullish outside of that headline figure.
So what I'm trying to say is I believe Bitcoin is more then skin deep. I certainly dont expect it to have lasted this long if it were only driven by exchanges and centralised dealers, BTC has surpassed and surprised so many people. Even the people most negative on Bitcoin have gained at least some respect for its durability and ability to propagate around the world and provide some utility.
Theres always an argument for competition but to be worthless I think would have come back to day one and the base protocol for BTC and was there a flaw or not. Of course we had doubts and passed them but its not impossible a problem lies unknown still. The only scenario for worthless is if they could not patch a major vulnerability or failure, nothing is impossible but its been ten years so far so good