I think you are massively over-estimating the difficulty of mining anonymously (as is usual with these debates).

Firstly, there is no particular reason mining on a pool requires a lot of bandwidth. Stratum with high difficulty shares already cut bandwidth usage very low.

For running the full node/pool itself, resource requirements are low. You can connect to the P2P network to gather transactions just like any other client. Nobody knows you are mining, even without Tor, as your behaviour is indistinguishable from any other node. Nodes can synchronise their mempools are startup and then know what each peers preferred block contents is likely to be: once solved, a block can be transmitted as a delta against the expected contents. This has the side effect of increasing bandwidth requirements for people who want to mine empty blocks, which is satisfying.

However, even without that change, I can't see a time when mining anonymously is impossible. Your argument, as always, relies on the assumption that "things" cannot possibly scale up, where the thing here is Tor. Tor can scale, so even if mining ends up requiring a lot of bandwidth it doesn't change anything.

Honestly Peter, to be blunt I long ago concluded you're just working backwards from your preferred outcome. You don't want Bitcoin to scale up, and you will continue to invent ever more convoluted and baseless theories as to why it can't, until the end of time. Convincing you doesn't seem to be possible.