Not necessarily. Mostly because most of the world still runs on GSM and since the iPhone runs on GSM, there's still a huge worldwide market for this device. I personally think the iPhone 5 will likely offer LTE, since worldwide rollout of LTE will start to increase in 2011.
There is a large worldwide market, but the core is still in the US just as it is for most Apple products. US marketshare of Macs, for instance, sits at somewhere around 10%. In Europe it is just under 5%. And remember that the iPhone is small potatoes compared to Symbian with nearly 50% of all global smartphones running it.
That's another factor as Nokia seems to want to try to aggressively go after the smartphone market in the US... again.
But LTE data plans arriving on Verizon well before they arrive on AT&T with Android gaining ground is not good for the iPhone. Some of the worst press about the iPhone has come over it dumping out of 3G coverage - AT&T's issue, but it affects the iPhone.
Android has pulled ahead of the iPhone in only about year and has momentum. The largest cell carrier pushing aggressive LTE data rates with Android phones come Christmas time spells trouble.
Like I've said, expect Verizon to launch a "Recycle Your iPhone" event during the Christmas shopping season and give big discounts on Android phones when you "upgrade" from the iPhone to a brand new LTE enabled handset. The Eastern Seaboard will be pretty much completely covered in November in Verizon's LTE. I've seen the coverage map of what is already installed and it's nearly 3/4 the size of Verizon's 3G map.
In the United States this is the end game for Verizon. They've been focused on this for the last couple of years. If iPhone comes to Verizon it will only be because Apple bowed before Verizon to save themselves. Internal Verizon research has indicated that a year after LTE is introduced and Android LTE phones are pushed, that the iPhone marketshare would be cut by more than 50% in the US.
Apple needs Verizon. Verizon doesn't need Apple. And if the iPhone begins decline then Apple stock begins declining. Apple's not going anywhere, but the strong rise of the stock and market capitalization is nearing an end. Innovation has died at Apple and they are living off past successes. The first iPhone was a stunner, but what's happened since then? The iPad has really been fairly ho-hum and more competition is coming. The Macs have looked and acted the same for the past couple of years and now the PC side is making much better computers at lower prices.
In the next year, Apple will have some big decisions to make. If they can no longer innovate and lead they will still be profitable for some time, but they will begin a slow spiral downward ala Microsoft.