This.
I assume there is some sort of Cozumel dive business association (if not, the group that Christi has mentioned currently wrestling with the
Sunscape/Secrets/Residencias "pier fee" fiasco would appear to be the nucleus of such a group slowly forming). Those whose livelihood depends on the ability to actually get divers in the water (you're not making money on days everyone's sitting it out) might want to brainstorm on a ways the island's dive ops could join forces to come up with a way to enable some operations on the east side during a norte. A pier would be great, but as suggested above a ramp would work for boats that could be trailered over (small ones, or maybe even Zodiacs). Maybe start with just a plan for guided shore diving, as everyone becomes more familiar and comfortable over there, everyone figures out how to work through the logistics, then slowly and carefully take next steps to incrementally improve and upgrade what's in place and their procedures.
Some January day when the port has been closed for a couple days, dive ops get out your pencils and figure how much a port closure really costs, and balance that against what it would cost to take modest and reasonable steps to start enabling east side operations. Yeah, I know, it's not gonna be cheap, easy or fun. The question is, if dive shops worked together, could something be done to make it reasonable enough to eventually work for the parties involved.
With global climate change a reality (well for most rational people - take that argument elsewhere please) are Nortes occurring with more (or less) frequency and/or intensity? I have no idea, but if I owned a dive shop on Cozumel, I'd ponder what that would mean for my business' future. Even assuming no difference from the historic norms, I'd take a look at the east side and ask, "what would it really take to be able to do some kind of diving there, and does that make economic sense?" If it's just plain impossible, OK, but...when people are getting on the ferry to Playa del Carmen and doing dives over there when the port is closed, it would make me wonder if there wasn't a way to enable diving elsewhere on the island.
Just a thought. Cheers.