Metenox is replacing the throngs of carebear miners going to rent null space, while also closing off renting. It’s not unusual for isk flow to slow down between wars and expansions, but we’re currently at what is shown historically as the lowest amount of isk flow in a long time.
This is hardly the end of the world, so if you also keep an eye on alliance movements you’ll notice some dominos falling across the board. Either war is coming and people are saving up for it, or some recent choices nullbears are making is cutting pretty deep into the pockets of the workforce.
Slight edit to include that renting has not really gone away. They are just using different language. My corp leader, for example, was recently in a renter corp of fewer than 50 living people whining about their rent going up.