Conceptual Issues with operational handling of letsencrypt

I wonder if this means LE has less than 89 days now to get auto renewals working in LE clients ? @bmw @jcjones what if some folks don't update their LE clients (3rd party included - fragmentation of 3rd party client concerns) to latest one that supports auto renewal and they haven't setup their own auto renewal process ? They would reply on the email notification for renewal right ? But as email rego is not compulsory what about folks who didn't register an email address and do not have notifications nor did they update their LE clients ?