I disembarked a Regent ship last Friday in Iceland, having sailed across from Canada and Greenland (which was a revelation by the way).
I mentioned this Ritz Carlton initiative to several passengers and no one had heard of it. And Regent (and also Seabourn and Silversea) offer enormous incentives to book another cruise when on board - big discounts and upgrades, including Business Class air travel etc.
RC will have to work extremely hard to tempt people off their current cruise lines/ships of choice.