The RFU can't step in they don't have the funds OR the bloody knowledge.
Then if they cannot and the PRL continues the game is dead, the only question is when we pronounce a date and time.
This, 100%, there is no one else, unlike soccer there is not an endless string of v rich people wishing to spend, or brands such as Man U that are worth masses. It is v unequal but changes do happen and for those who like soccer but not the Prem there are healthy offerings all the way to the conference level and beyond.
Rugby may have thought it was running a parallel course, perhaps the effervescence of professionalism meant that rugby and probably many of us, thought that with the money put into now defunct teams, there would always be funding.
The other countries (Scotland, Ireland and Wales) have had their ups and downs but have come to a point where they seem to have control over the top level and are competing in an interesting comp too.
That the EA's were allowed to not open their books but suffer relegation and keep their P share is evidence of a game where no one is in position to judge the current position nor recommend a way forwards. This position (or lack of) is demonstrated by the loss of two teams this season (I'm not optimistic) and at least three more in dire straits.
Either England rugby comes together and is open about the current situation and associated risks or else the RFU and PRL are pissing in the wind. Income from internationals, sponsorship and TV is limited, and there has to be a view of how the money is organised and what individuals can do.
Easily could, be a dying game if no one is prepared to admit there are problems and look to the future.