Arena is going to need changes moving forward regarding its formats. My question pertains to if arena will cause the creation of a new format to include cards that are on the platform (once existing sets begin to rotate out of standard). Currently there is no way to exchange your cards, not for a reasonable value at least. I'm just thinking ahead to what happens when all those x4 Mythics players own are no longer standard playable. That is a lot of time and in some cases money invested into earning cards no longer playable outside of casual MTG.
Everyone is on an Arena high right now, but I think there is a
crash to come unlike anything we've ever seen at standard rotation in the past. A rotation where your cards have no other format to be played in outside of casual and cannot be sold is going to be a monumental fail. I really assume WotC has planned ahead on this one. This might not hit the gamer section of the Arena player base hard, but entrenched MTG players are going to
backlash against this if there is not a proper plan in place (either a new format or the expansion into past sets opening up existing formats.