For consumers of the information and those paying for it, it’s all upside to me. My only prediction for downside will be increased author fees for open access publications. Some venues have ridiculously high fees for open access authors, which is a barrier for some (not every author is funded by a research grant or in a department with a budget that can cover such fees). I expect they’ll go even higher, and the available exceptions or discounts will be more stringent. To me, the upsides vastly outweigh that downside though, so I’m very happy to see this move.