We now have miners with hundreds of thousands of dollars of equipment

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We now have miners with hundreds of thousands of dollars of equipment which run it off a raspberry pi. Who send their coins directly to coinbase to be sold. Who have never used a Bitcoin client of any kind (except for the coinbase webwallet), certainly not a full node, and they have no concept of why they'd want to. The name they trust most in mining is operator of their chosen pool— who could be robbing them blind, but maybe isn't— who has a financial interest to the tune of— say— >$700,000/month in keeping miners on their pool, and who tells them they don't need to worry about things, and who is believed because far too many people— including you— overly fixate on "51%" and ignore the fact that someone who controls 25% hashpower can reorg 6 confirms with 5% success or 2 with 31% success.
. . .
Perhaps many miners could be moved to running something p2pool like if doing so was easy, but just running a Bitcoin node is no longer so easy that it can be treated as costless, with now gigabytes of space wasted by pointless dust-scale messaging transactions. Transactions that the Bitcoin users didn't care about because they weren't running nodes and because many people had a monetary interest in being able to wastefully use the systems resources in that manner.
In any case, I don't think the problems you're facing are technical. The problem is that participants in the system don't know or care. I think the problem is also that to some extent people who should know better are not paying attention to the mining ecosystem and don't realize what a mess things are, and some who do are tempering their statements because saying "Hey everyone, the Bitcoin security assumptions are basically invalid in the current environment" too loudly may be adverse to the value of their holdings.
If you can figure how to educate people on the subject in a world where people have multimillion dollar a year income streams that depend on hashers not being educated and while other people own hundreds of millions of dollars of Bitcoin whos value might be eroded if the concerns become too wide spread— then I think progress could be made.