There have been some previous indications that Roman position in Italy is simply too weak in relation to other central Italian powers, at least from historical perspective. Apparently Etruscans alone are a decent challenge to Rome.
True. During this period Rome had population of around 100,000 but not more. (didn't hit 200,000 until the mid of second century BC and 400,000 at the end of the same century)
Tiny in comparison to Athens (300,000+) let alone Babylon (estimated 1,000,000 at least) or Susa (around half million)
It was a streak of great leaders, cunning and sheer luck that allowed Rome to flourish and build an empire.
Had it been less lucky (due to diplomatic circumstances), it should have been wiped from history, having left the Hellenistic world intact.
Which could have led our civilization been 500-600 years more advanced than it is today.