No one but you is mentioning fairness, it's not really relevant in this type of business. If the Pro14 becomes a second tier competition and Europe turns into an Anglo-French competition that France cares even less about the French pull out of Europe, revert back to a Top 16 and and make up a lot of the difference from European rugby because their rugby league doesn't pale in comparison to their football league and hasn't got any other sports to compete with. They have a bigger population, they're fine without Europe, it's completely sustainable for them. Not so much for the English clubs who badly need Europe and therefore the Irish, Welsh and Scottish (Leaving out the Italians as we are literally propping them up in the hope it makes money in the long run) so it is a simple economic decision to keep these clubs competitive. It is an incredibly shortsighted decision for these debt ridden clubs to attempt to maximise earnings now, attempt to buy all the best players from Wales, Scotland and Ireland and expect to be able to continue making enough money to compete with the earnings of their big brothers in France when they're only source of income is the Aviva Premiership.
Or you can hope three unions from countries who have a combined population of 15million where rugby is the 2nd most popular sport in two and 4th most popular sport in one to pull a huge TV deal out of the Sky because they're doing everything the English and French are, they just have an audience a fraction of the size...
The best stadium in the competition is owned by a Pro12 side by the way, as is the best academy, the current tournament favourites aren't in the prem or Top14, two French sides and the Irish sides are the only ones with more than two wins and you have the arrogance to say the Pro12 does nothing towards generating money for this competition and that their clubs aren't run as well... Ask the French if they want to watch a European tournament without Leinster, Ulster, Munster, Ospreys or Scarlets, find bigger inter-country rivalries than Leinster-Clermont or Munster-Toulouse in the history of this tournament (fixtures that can sell out finals and semis by the way) and tell me the Pro12 contributes nothing towards generating money in this competition and tell me that the Premiership clubs are better off slowly letting club rugby in these countries die and survive on their own because you'd be showing the short-sightedness and pig-headedness of the PRL, who only a few years ago criticised the Pro12 for not having relegation and are now pushing for a closed shop themselves, if you do. I'd understand your argument from a French perspective, not an English one though because you become the vulnerable ones without us and don't have the leverage of maintaining a competitive European competition. The English clubs need the Pro12 clubs far more than you seem to think.
You're claim in the second to last paragraph is wrong by the way, Amiga addressed that way back, the competing English and French sides got more than any of the union clubs in the old deal.
The comparison to football is also an interesting one, you're advocating doing what they do and hoping for different results. Leinster, Munster, Ulster, Ospreys, Scarlets etc... will all die as European powers like Ajax, Benfica, Celtic, Porto, Feynoord etc... have.
I kind of understand wanting everyone to be held to the same standard and be given the same, it does sound nice but it won't work in practice.