You will still upgrade your character and stats at level 60, you just won't do it by putting "points" into skills and attributes that you can't change or take back later. You will improve and adjust your character by finding, buying, and equiping better gear. Everyone at 60 will have the same base stats and skills, but their gear will make certain stats and skills much more powerful than others. You are going to have to make choices how you want to focus your character at 60, very specific choices, if you want to survive in Inferno at all. Base skills aren't going to cut it. Blizzard just changed the mechanic of HOW you adjust those stats and skills.