Concerning Alchemy

Ok so I talked about this on twitter but should probably talk on here just in case. So I was planning on doing mostly magic arena content, and they have just announced Alchemy, a format adjacent to standard where there will be arena exclusive cards, which I'm pretty ok with actually, and rebalanced versions of standard cards, which I'm fine with in theory. The problem comes to "eternal" formats like Historic and Gladiator. They've said the rebalanced cards will see an influx into historic, but haven't said what the availability will be to these cards outside of the "Live formats" as they're being called. So I'm worried what this will do to 2 of my favorite magic formats, and 2 of the formats I was planning on streaming the most, second only to standard. What do you guys think? Any thoughts or concerns going forward with Alchemy or Arena in general?