I think the last few years of GT1 have well prepared them for that.
Must be sad for ACO to see such a drop of in GTE grid numbers all over the place, especially as after the demise of FIA GT2 there really has been only one European competitor for them. It's quite interesting how Manthey, Lotus and others opted for IGTO instead. Unlike some guys over at RLM would say, there appears to be some need for sprint-based GT racing after all