Can the reaction of "Cron Maintenance" in the Rules modules pull data from nodes?
Previous Attempt: Have a node become stickied when a comment is
  posted. Then unsticky the node after a certain amount of time. If a
  node is not stickied, send an email. This worked for one evaluation
  time rather than having evaluation over the life of the node.


Activate the Rules Scheduler module (comes with Rules)

Sorry, I missed a step. For your If and Else Statement Add Action of Schedule Component Evaluation and select your component. So you basically re-schedule your component evaluation. Thus, you get continuous evaluation.



Result: