“Bitcoin” doesn’t have a government (a coercion power), and thus must really on market processes i.e. on prices, which are determined by supply and demand. Consumer's wants and needs are signaled through prices, which are in turn satisfied by producers, who want to make a profit.
In this sense, it seems to be a “Bitcoin” systemic flaw, that a valuable information like the “timechain” is not provided to the consumer in exchange for Sats; i.e. no market, no price mechanism and thus no profit or economic calculation in Sat terms for archival full node operators.
How could storage devices be allocated in the “Bitcoin”-Network in a <decentralized> and thus sustainable way without a market for the “timechain file”? A market emerging ideally via enabled exchanges of the “timechain file” and Sats on “Bitcoin”-protocol level.
PS: "timechain file" to be understood as abstraction for the different database files used and needed by the IBD phase and resynchronization of a full node.