@polar there isn’t (currently) a specific place for community suggestions/discussion here on long term roadmap. It would be good to do something for this coming up to Fusaka upgrade planning.
There are discussion posts in Eth Magicians for each upgrade that anyone can post to:
EF Research AMA on Reddit is generally a great place to ask questions about the research vision.
https://www.reddit.com/r/ethereum/comments/1f81ntr/ama_we_are_ef_research_pt_12_05_september_2024/
Devcon had: Ethereum Magicians Infinite Endgames Session @ Devcon SEA
An Ethereum 2025+ survey/input from the community could be interesting. If you are interested we could create a discussions thread on Eth Magicians to flesh out what to ask.