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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
Older blocks, transactions and receipts/logs would still be accessible through dedicated sub-protocols (eg. the Portal Network) or externally developed protocols (eg. TheGraph), in addition to a much smaller but still sufficient number of volunteer nodes and block explorers. Note that many dapps are already moving their historical data queries to TheGraph and similar protocols for efficiency.
I think there is always a lot of value in taking more technical discussions (e.g. this AMA) and converting it into a more digestible format. Unfortunately I'm not as plugged into the needs for technical writers. You may checkout the ethereum.org team, they've been doing a lot of great technical writing.