What if support options were a separate subscription, or otherwise current members were grandfathered, and could purchase the support option (e.g., Classic Advanced, Classic Premium)? TBH, there's not much in the other levels that starter doesn't have now, but premium does have the 10% discount.
There will be more separation as we go along, but for now we can only comment of things that are relevant to existing functionality. As for current memberships - we just plan to just maintain them as is. Current Premium will stay Premium, current Advanced to stay Advanced. This may prove as a bit of a challenge for our support line at first, but we hope to manage with help of improved Knowledge Base and clear SLA.