Other discussions have made much of the inefficiency of the Mars Cycler concept. I won't get into that here.
But what about setting up Mars Cycler infrastructure as a lifeboat or safety system?
Five Cyclers, each loaded with the propellant necessary to effect MOI, EOI, TMI, and TEI maneuvers, could be kept in hibernation. In the tragic event that some Mars mission must make an emergency launch, outside of its normal launch window, the nearest Cycler would be woken up and dispatched to rendezvous and rescue the ill-fated explorers.
I mean this for scenarios where the option of linking up with a Cycler is preferable to having no options at all. Normal missions would only carry consumables for planned mission activities, plus the usual contingency stores. The Cyclers would carry additional consumables to effect the necessary rescue delta-V, and sustain any personnel on their way back home.
Does that make any sense?