In a note to clients — as reported by “Fortune” — Piper Jaffray analyst Gene Munster says the looming map wars (or perhaps that should be “reported” Map wars — in which Apple is reportedly planning to replace Google Maps as iOS’s default mapping app — isn’t likely to tip the balance one way or the other.

If Apple does drop Google Maps from the iPhone and iPad, Google will probably stick around, turning it into stand-alone app on the Apple App Store, the analyst thinks. Munster estimates that Google will generate about US$4.5 billion in gross mobile revenue in 2012 — $4 billion) from search ads and the rest ($500 million) from display. He believes that iOS is likely to remain the biggest or close to the biggest source of that revenue, generating roughly 40% of the total (or $1.6 billion). Assuming Google keeps half (after subtracting so-called acquisition costs), iOS would generate about 2% of Google’s total revenue in 2012.

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