Who's to say he was ever THAT great to begin with? The talent pool nowadays can make make someone like him look rather mediocre, especially when he's not in a top car tailored to his preferences (which atm is likely very important for him to compete at the top level).
According to who? I simply stated the car is likely to blame for Michael's lack luster performance this year - now what does this mean? It means Schumacher lacks adaptability (which is a skill in itself). The same can be said for Button to a lesser extent.
To an extent this is true. Although we've seen that guys like Hamilton can get the most out of anything, which is a great skill in itself.
I'm sure Mercedes and Schumacher knows what's best for them better than either you or me, so lets just let time run its course and give Schumacher a PROPER chance in a car he has helped tailor (something he has proven to be good at), not some hand-me-down car (last time he had to deal with something like that was 96'

!) which he clearly has been unhappy with.