Yeah, I would very much not be a fan of mtg bleeding over into Forgotten Realms. While the D&D settings have typically had a degree of interconnectedness or at least common foundations through shared elements, I don't want mtg in my Forgotten Realms, particularly with the ongoing decline in mtg's storytelling. Let the settings remain separate and celebrate their distinctiveness. But it is an eventual possibility that WoTC has been toying with, even if we haven't seen them commit to it (yet).