Here is the wording of the warning email. In no way does it genuinely indicate the entire network will cease to operate. And the link sent above is an explanation after the fact.
Thank you for being a valued Meraki customer. Our records show that your organization is over the device limit for your Meraki Cloud license.
If you wish to continue using your Meraki networks, you must renew your license immediately. If you choose not to renew, your Meraki systems will cease to provide network access on August 25, 2023. If you have recently made a Meraki purchase, please add your license key to your Dashboard account.
Licensing information can be viewed here: XXXXXXXX
To purchase additional licenses, please contact Meraki Sales or your authorized Meraki reseller. You can find contact information at meraki.cisco.com.
Please let us know if you have any questions. A license expiration FAQ is also available on our website.
Regards,
The Cisco Meraki Team
So in the wording "your Meraki Systems", I think a reasonable interpretation would be that the units in question would cease functioning, which I was fine with.
So I 100% disagree with the several commenters above.