You fail to understand the technical problem in the OP. Merged mining does not fix the threat. The threat is the corporations can make it uneconomic to mine because they can offer it for free and the other miners will get paid nothing for mining, thus they control all of the mining (merged or otherwise). Before you attack that, go re-read the OP more carefully.
Technically it may be a logical outcome, but how will the alpha-males work harmoniously together to form and continue this cartel?
On world-scale there exists no such 51%-entity, AFAIK. Human nature breaks organisations down internally long before world domination and after a break they will compete which each other, since they both think they are on the right track.
The largest companies and countries are small at the global scale, only one's exposure to one of them can be particularly large. So Bitcoin can be sufficiently protected by size and dispersity.
Cartels work together because they can earn more rents together than separate. They eliminate competition which drives their rents up (competition drives rents down). So the strongest get together.
Over time, the cartels consolidate more, eliminating the weakest within them. They end up as a single controller, which of course is failure, because no single person can run a free market.
Thus they are ultimately == death (for everyone). If it goes that far. Usually before that, mankind will cut off their heads (e.g. in France), but the problem this time is they are far away. Everything is digital. We can't even find them.
This horrifies me.
I think you should go study how Rockefeller monopolized all oil and railroads in USA, if you believe cartels don't form naturally when the economics allow it.
I am proposing to change the design so that the economics will no longer allow it. Bitcoin allows it. My design does not.