The topic is called 'Possible ACO changes to the GT format' but it seems that the ACO will make several changes to GT. They might not exactly switch to GT3-running cars but then they might. As for GT1 being the premium GT class, doesn't mean anything if there are no cars fielded ALMS next year. What the ACO decides will affect both ALMS and LMS championships.

Plus several national GT championships are using the GT3 format as their premier class. British GT, Belcar, and some French FT series have made the switch. Speed GT is a single driver sprint because there is not a multi-driver lineup. Plus I find the FIA GT3 manufacturer line-up much more appealing.