"D&D and MtG combined make more money than Transformers, Power Rangers, My Little Pony, and Monopoly combined, as was revealed in recent shake-ups following WotC's last earnings call. That's ridiculous. That means that 5E isn't just a juggernaut in the market, it is now the engine that generates the market that every other game exists within. And that's not unusual, D&D has long been the centerpiece of the TTRPG world and is really the thing that opened the door for everything that's come since."
Not to rock the boat, but actually that doesn't tell us all that much about D&D, necessarily. In the past, it was always considered a trusim that MtG is where the money was for WotC and that D&D was a project of love, not profit. I'm sure that's not entirely true now (or if it ever truly was), but the degree to which it isn't is still unknown, unless there's a lot more detailed information in that earnings call than I'm aware of.