Thanks for raising this! Classic Retool will continue to be supported for at least two years after the new experience reaches GA, so you'll have plenty of time to plan any migration. We do expect customers to move to the new experience over time, but there's no immediate cutoff or action you need to take today. Your production tools on classic aren't going anywhere. We’re also still committed to fixing blocking issues and incidents for folks using the classic app builder throughout that period.
If there’s anything else holding you back from converting your apps today, we’d be open to the feedback!