Wouldn't have made much of a difference as Odoacer simply bypassed Ravenna (and would have bypassed San Marino) on his way to sacking Rome. Rome at that time had fallen far from grace, but the sacking was the nail on the coffin.

The true strength of Rome had already left, gone east to Constantinople. 4th/5th century western Rome was just a slow and painful decay. The East survived until 1453.

Fun little fact: the Roman Empire existed until 1453 and was finally destroyed by the Ottomans; the Ottomans existed until the end of WW1; the Cubbies last won the world series in 1908; which all means: the last time the Cubs won the world series, the empire that destroyed the Roman empire was still around.