Do you have Inst. students lined up or ready to train? If not, I'd apply the cost benefit approach. What's it going to cost you, and what's the benefit? I'm sure the online renewal is going to be cheaper than the II ride.

Get this taken care of this month though, if you let your CFI lapse by default you'll be forced into the expensive option! Once your CFI expires, I think you'll have to do a reinstatement ride before you could add a rating.