There are two types of people in the market, the buyers and the sellers. There won’t be buyers if some hodlers won’t decide to sell, as well as there won’t be sellers if there are no buyers in the market. So they simply complement each other to create a healthy and sustainable market.
What you are saying here is very impossible, yes bitcoin is limited but it will never reach to the point that there’ll be no bitcoin available to buy.
Essentially price increases are influenced by the level of buying and selling, so this issue can be resolved.
Bitcoin is indeed limited in supply, but that doesn't mean everyone will hold it and not sell it.
There are times when people sell to cash in profits, and on the other hand, there will be people who buy it to increase their asset holdings.
Supply and demand will always be the benchmark for a product's existence in the market, and its sustainability can be measured at a fundamental level based on the adoption and interest of the majority of people currently.