Time brings changes of value, and sometimes, with it, mediocrity. Recall that when there were Chopins, Mozarts and Beethovens, the people who could learn to use those instruments were limited, largely by socioeconomic factors. Now we have more access, including to those artists themselves to learn from. So, we have taken something that was elite and limited and broadened it out. Also, we can't really replicate the past. It's, to take your music analogy, like a band coming back together after a while and someone asks, "Will this album be like your first one?" And the answer to that is a hard "No." Why? Because the musicians have learned from their debut album, their mistakes and have changed musically with time. To recreate the past would basically be like saying "pretend TOS et. al" doesn't exist and make Star Trek. How do you do that in a culture that has had Star Trek for 50 years?