But if I understood everything correctly the London update is not supposed to improve scalability. I think that is what most people are waiting for, low transaction fees. That is supposed to be done with the next update, but that one will be far in the future. As far as I know Vitalik Buterin said that is not going to happen before late 2022. As he is conservative usually with his deadlines, I hope an update that improves scalability will come even earlier.
sharding in ethereum blockchain will needed to make low transaction fee, if there is no update about it i think gas fee will still the same with previous fee and there is no significant reduce except from network traffic that decrease. Transaction fee still be main concern for ethereum core developers to take back the position on number project that launched in this platform.
It will remain the main issue for the developers forever as there is no solution that will allow for unlimited scalability if I understand the current core protocol correctly. They might be able to steadily improve, but with improvements grows demand and the question is whether demand will always outgrow improvements. I have no idea as I am not sufficiently deep into scalability software solutions, but this is how I perceive the process kind of.