Is only the government policies could stop growth of bitcoin thats if it possible given the decentralize nature of bitcoin , otherwise bitcoin has come to stay for a long time. Although, if it does not transform to fiat / paper money, then some day, it will lose it value either to another cryto or something replacing crpto because nothing stays permanent for ever except God.
You are absolutely right that noting stays permanent for ever except Allah. In my opinion more and more governments are going to legalize bitcoin as I was reading somewhere in this forum two days ago that the government of India regularize bitcoin and there were some links to governments websites about that announcement which I do not studied/read but it just an example that different countries are working on it.