(full disclosure, I work for Google but have no special insights here other than reading the article)
My interpretation is that you'll still be able to use your account on Youtube, Play Store, etc. You'll just lose the workspace specific features like Drive, so use the tools that let you dump that data.
Exactly, since Android and Youtube aren't "workspace core services" (the next sentence after the one you quoted explicitly mentions YT and Photos), your purchases are probably safe past the deadline.
However, now what do you sign into your Android device with? Google's products work... poorly... across multiple accounts. I needed to change my email address a number of years ago, which is impossible with Google's apparent use of email addresses as a primary key or something, and my Google account has had to live in a very messy state ever since... the old address has to be the core of the account for all services, even if I'm handing out and sending as a new address... and that account is an extra security vector into it... (Meanwhile, Microsoft just lets you add and remove email addresses from your Microsoft account, including changing and removing the primary.)
I think that depends on how much storage this person is using.
Google includes Photos against the billed quota, so if you have more than 15GB of photos then Google will surely do something, either restrict access or eventually delete the data.
