Not only that, it's really not Etsy that is forcing this change, it's consumer behavior that has been changed by access to free, fast shipping by both Amazon and others. Etsy has little choice but to ride that wave. If they didn't make this change, sellers on Etsy would be pushed out in the long term anyway.
Not only that, but it's clear that sellers on Amazon often price their shipping costs into the product price, which is the exact option that Etsy built explicitly into this switch: When turning on free shipping, sellers had the ability to say "change my product prices to be [current price] + [shipping cost].
Finally, I sell on Etsy. I switched to free shipping mid July. My sales have improved by about 30% over where I'd expect them to be for this time period. More people are buying more items to get to that $35 threshold. It more than covers the difference in shipping.
Sure, that positive scenario may not play out for all sellers. But then the long term picture wouldn't have been any better as Amazon's own "handmade" venue and cheap mass-produced alternatives eat their sales.