A step-by-step roadmap for scaling rollups with calldata expansion and sharding

https://notes.ethereum.org/@vbuterin/data_sharding_roadmap

This takes EIP 4488 (or 4490 if we want) as a starting point, and then describes a phased sharding rollout that unlocks more and more data space with increasing security over time as the logical next step.

The goal in all of this is to increase the amount of data space available to rollups, decreasing their fees as fast and as soon as possible.

Would appreciate any feedback!