I think the use of the word "tomorrow" is inappropriate, it is better to use the word "one day." Because it seems like it will come soon, when what the OP meant was when the mining rewards run out, and that is still a long way off. Regarding your question, I don't think it is possible for Bitcoin to collapse, because we know that there will be many people who will continue to keep the network alive. This is similar to Bitcoin's early launch phase. I believe that during the first to three years of its launch, many people were mining Bitcoin, and perhaps at that time some people still didn't realize Bitcoin's enormous potential, but I'm sure they would still mine it at that day. So I feel that in the future, people will continue to maintain the Bitcoin network, especially if Bitcoin has experienced widespread adoption throughout the world, then I am sure Bitcoin will never collapse.