Excellent points. I agree that it’s highly probable that Islam will wipe old-style leftism off the map. Off the planet.
Regardless of any military tactic, strategy or border wars (And I mean ANY) Islam will win through the loins of their women.
If we were to somehow “wipe them out” their kids will need to be dealt with for more than a 100 years - possibly with a second pass at wiping them out.