While I agree in principle, I would quibble that writers have always taken liberties with "rules" where they felt the need. The split infinitive is a good case. It's not a rule that is "finally" going away. It's more a rule that never had an entirely secure foothold to begin with. Back in the 1970's, I learned that the rule came about by imposition of Latin rules on English. In Latin, it's not possible to split an infinitive. But as it turns out, it's also not possible in Old English. Only in Middle English did it become possible and could be found in literature as far back as the 14th century. See https://en.wikipedia.org/wiki/Split_infinitive.) In modern English, it's always been around to some degree. Even Shakespeare did it on rare occasion. The rule against split infinitives only arose in the late 19th century, and even then it was often argued against and broken. It may be that the educational system is less insistent upon certain rules than it used to be. I don't know about that. But writers have always taken liberties with them.