There is no official migration path to a normal consumer Google/Gmail account. That's what they were indicating for quite a while that they would start offering

There is no official migration path to a normal consumer Google/Gmail account. That's what they were indicating for quite a while that they would start offering around now, but with today's news it seems like they've had a change of mind. Exporting your email data and importing it into a different provider (and perhaps more importantly, changing the MX DNS record on your domain) should work fine though. Your inbox on the Google side will just cease receiving new email.