Although, it's likely BTC will keep rising in price up until the very last minted coin. That's projected to happen within 2140. Neither you or I will be alive by that time. Just take advantage of sudden "pumps" to make profit and forget about the rest. 
You have made a good point that the price of BTC will continue to rise until the ocean is gone, but according to the current context, it seems uncertain that the last coin will be created. As we move forward with the modern world, these coins will increase day by day, it is not right for us to imagine their end because if we keep up with the modern world, they will continue to exist.However, the idea you have given is expected to be made by the year 2140. We are only imagining such predictions, we do not know how much they will be realized. Because we do not know whether we will survive until then, but it is better not to make such thoughts at the present time because what will happen next depends on the future, how we are currently moving towards making profits according to the opportunities. Sometimes it is surprising to think that if we were to survive then, maybe we could see the situation, but according to the laws of nature, maybe we will leave before that, we will not be lucky enough to see them.