When CL rotates out of modern, it is still going to be the cheapest way to get into the game by far. And you can currently buy maxed untamed cards for as little as $6 (and dropping quickly). That won't be the case with rebellion or the next set until they rotate to Wild. So, new players are going to be attracted to wild and they will be confronted with a choice. Either they can buy a bunch of powerful and inexpensive cards and start playing in Wild (and have to pay to play-yuck!) or they can dump a bucket of money on modern cards but skip the pay to play. Both options have an element of feeling bad and that means most players will not stick around.