That essentially requires 4 straight seasons at 20 goals a season in the league and say 5 each year in the cup. Or it requires someone to spend almost all their career with one club.
Since the golden boot tends to be won now with not many more than 20, someone would have to be there or thereabouts for four complete seasons. The chances of that happening,in terms of injuries, loss of form, and so on, are in my view pretty slim.
Also, not many players tend to stay with one club for that sort of period of time any more, and certainly not 20 goals a season players. Never mind City, there are only a few I can think of who might qualify - Drogba, Lampard, Rooney. Also, there aren't many players who stay at one club for their whole career - Gerrard springs to mind, but he is the only one I can think of who might be in the vicinity of 100 goals.
Theree are certainly some who have the potential at City - Aguero, Tevez, Dzeko - but will they stay the four or five years it would take, and stay in form and injury free, to get 100 goals? Maybe, but it is a big ask.
I know he scored most of his goals in the lower leagues, but when you think about it in terms of how likely it is to be done again, it makes you think how impressive Goats hundred odd goals were.
Especially the 99th. ;-)