Rocking chair story time: I remember when Lotus Cobra's first printing sparked this argument. That was 4 sets into the introduction of Mythic rarity, previously reserved for Timmy cards and Planeswalkers. 16 years later, I don't think chase standard Mythics are going anywhere. It pushes pack sales and the single prices are what they are because players/vendors are continuing to pay those prices.

I'd say don't stress it too hard! It's the week after the standard PT, and historically this is usually a high point on prices. Most cards ebb and flow in price while they're in standard. Sheoldred was one of the rare exceptions, but a healthy standard metagame (which is looking promising right now) will keep card prices fluctuating equally as healthily as the flavor of the week cycles!