You couldn't make Home Alone 2: Lost in New York today because Macaulay Culkin is an adult now and nobody wants to see a grown man playing a young child.
There was a remake idea floating around the Internet, even with a petition and such, that asked for the first Home Alone to be remade, but to still cast Macauley Macaulay Culkin Culkin as 8 year old Kevin without anyone acknowledging the age discrepancy.
Culkin even chimed in at some point and tweeted that he would be down for it. And honestly? I would definitely watch that.