I second Amanda's suggestions about including more filters around program channel updates to also identify people who took an action resulting in their program status change in Marketo (of course, it's imperative to have a setup around updating program status for your programs first), filled out your social forms in case you use those, etc.
For the Clicked Link in Email filter specifically, I want to mention to not rely a lot on it to determine if a record is engaged or not, as a lot of times these clicks are from email scanners. If you have the bot filtering feature turned on and are logging bot activities in your subscription, you might also want to include the "Is Bot Activity = False" constraint in the "Clicked Link in Email" filter.
Additionally, along with pulling the count of active/engaged records, you might also want to check how many of these active records are currently marketable - i.e., their Email Address is not empty, and their Unsubscribed, Marketing Suspended, Email Invalid, Block Listed fields are set to False. Hope this helps. Let us know if you have questions.