This article touches on the idea of an event, which aligns with your language around a transition. That seems appropriate to me, e.g. the industrial revolution would be the event that kicked off the next epoch. Considering the profound impact we've had on the planet since the industrial revolution, it seems like a reasonable place in time to assert that a new epoch has begun, however. It has clearly started to take shape. We have already done 1.5C of warming, with all signs pointing to much more to come. Biodiversity is already plummeting and will continue to drop. It's perfectly reasonable to conclude that we've created a deviation from the Holocene normals and are simply calling this new thing something else, something undefined but clearly underway and likely to be as disruptive as any epoch change in the past. It's an observation that we've fucked things up, but it's not surprising that geologists aren't ready to make the leap to a formal name, especially one randomly invented by a dude in an off the cuff comment and not through the scientific process.