I know after the crushing defeat, Fabius delayed the war as long as possible, avoiding possible combats with Hannibal, while bolstering his forces. If Hannibal had decided to march straight to Rome, would it have been possible for him ? If so, how much would it have impacted the remainder of war ?
Hi, you might like a look at my conversation with /u/iguana_on_a_stick about Hannibal in Italy here.
There is of course further discussion to be had.