I remain resolutely confident that the true intent is to effectively kill non-jet general aviation, except to the limited extent required to provide pilots for jets. The nascent (but growing) trend to banning 100LL was expected to do the job, and the availability of a viable and readily-produced 100UL substitute is... inconvenient... to the effort to eviscerate GA. So, it is being ignored, stonewalled.
For those who believe this is only a problem for GAMI (or, for that matter, for the people who rely upon and require 100LL or equivalent, which represents the majority of the non-jet fuel used in GA), you're missing the bigger picture. GAMI met every requirement under the law for the approval of this fuel, even after extra steps were thrown in; the FAA people in charge of certifying the fuel (Wichita ACO) and "auditing" the results (Atlanta ACO - and this was an unprecedented requirement, thrown up in the face of the effort), have approved the STC without reservation. Notwithstanding all this, the FAA simply declines to approve without comment. So, the big picture: an utterly unaccountable administrative state is inventing new and secret rules.
Is this a representative government?