I currently have Verizon's 4G LTE on my phone, and even when I'm out in the boonies, I still receive 4G signal most of the time. So I can see how their LTE network will be as big as their 3G network, because I am hardly ever out of range of either. Verizon's 4G is very fast, so I am happy to see their 4G services expanding.
Michigan is pretty much blanketed in Verizon LTE now. They seem to have it every where I go. Even my very rural summer cabin in Northern Michigan has it now. Last summer it was 3G and 1X only so the expansion is definitely still moving forward.