Technologies will evolve. Advanced versions are and will be launched. Ethereum provides a lot of control and helps to build contracts. However, it is still not bulletproof. The community is working on Ethereum technology advancement to POS. I believe it is good for long term. However, holding for long-term totally depends on your risk appetite and things are ever changing.
maybe what you say can be a reality because of the expectations of the investors themselves along with the development of the times and technology to make crypto currencies will develop even though no one can know the future development