The rescheduling of the matches was the obvious, and correct, call by the people in charge of Serie A. There had been talk of Genoa fans refusing to travel to Milan for the match, and I would suspect that it would have been a very awkward and difficult situation for Sampdoria to hold a home match in Genoa this weekend.
Milan’s match against Genoa is now a mid-week clash, sandwiched between matches against Sampdoria and Udinese. Midweek matches can be tricky, but at least Milan don’t have to worry about the match falling the same week as the Derby della Madonnina or against the other “big” clubs such as Juventus, AS Roma, Lazio, or Napoli.
As it stands, the only effect this match being rescheduled has on any of the “big” matches is that Hakan Calhanoglu is now suspended for the match against Napoli, however, it also means that Milan have an extra week of rest and preparation that Napoli doesn’t have, so the disadvantage kind of balances out.