@jm_peterson You've captured the details of the "unverified profiles" very well and your rant is justified: once we knew that the Certificate Authority change was going to take place we should have done a better job at informing our customers about what was going on.
With regard to the current situation, as you pointed out, the warning is indeed cosmetic. However, clearly it is not a tenable situation for you to leave management profiles in place that are not part of a proper certificate trust chain.
As far as what to do right now:
* For profiles that are not the main management profile: any minor change, such as modifying the name of the profile, will cause it to refresh with the new root CA.
* For the main management profile, a re-enrollment will fix it, but as pointed out this is only useful when dealing with small numbers of devices directly. To solve the "at scale" issue we are developing a feature to re-install the management profile as a bulk action initiated by the Meraki Admin. I can't provide an ETA just yet but it is an important issue for us to get fixed, we don't want to leave those "unverified" profiles sitting out there confusing your users.
Once again, to all of our customers affected by this, please accept my apologies for how this issue was handled. We are hopeful we will have this remedied shortly.
Noah Salzman
Product Manager for Meraki SM