I agree with all posters that the focus should not be on putting other cities down, but there must also be a realization that regionalization (hopefully) will only bring lower costs. Obviously, if all Western Michigan airports are losing passengers to Chicago and Detroit, lower costs from a Western Michigan airport will beat traveling 3+ hours for cheaper fares.
MJLO, you can't convince me that what K-zoo, GR, and other Michigan cities are suffering from is a lack of land, and small civic boundaries. I grew up in the Boston area, and I don't believe that growth has anything to do with area. If anything, the ability to expand into "country" areas has hurt cities in Michigan more than anything, but I digress (that could be voiced in another thread). You make a good point that K-zoo has higher passenger volume than many other airports in the US, but, I ask you, how many of those other airports have very strong regional competition less than an hour away?
The point here is that the Grand Rapids airport has taken the steps, by building a large parking garage and luring a low cost carrier, to increase competition, which will hopefully lower prices. The long term impacts of this on other airports remains to be seen, but if the cities of this part of the state start to think regionally, everyone will likely benefit in the long term.