I would suggest an experiment, to move one single (well ranked) page to HTTPS, and see the traffic impact over some reporting period that makes sense. In terms

I would suggest an experiment, to move one single (well ranked) page to HTTPS, and see the traffic impact over some reporting period that makes sense. In terms of Google search, nowadays I'm not sure link longevity really matters; otherwise I don't think I would get spammy pages consistently as results.