That's true, but you could extend that argument to any situation in any band - or indeed in any walk of life -
What if Keith wasn't carrying that Muddy waters album on Dartford station, what if Mick had got a lift into town that day?
What if Mick Fleetwood hadn't heard Buckingham and Nicks recording their album?
What if Stewart Copeland hadn't left Curved Air ...
the list just goes on and on and on.
Bands are as much a victim of circumstance as the rest of us, which is a good, and a bad thing.