Wow, so many concerns.
Granted, I already have a wireless router so I am basically all set, but if you don't have one, you can get one
for the cost of a DS game.Yes it would be ideal if wired and wireless were both an option, but really the cost of switching to wireless isn't that great. If you're waiting for Revolution's online games, at least you know that you have at least a year and a half to dig up the $30 extra for a wireless router, if it doesn't include an ethernet port.
Frankly, as a side note, the wireless technology is more expensive than a physical port. The cost of an ethernet port is negligible if you're already incorporating networking capability. Not including a port would be more of a design choice, not so much a cost concern. But I digress.
Re: wired and wireless routers.
As others mentioned, and as you can see in the link above, most wireless routers also include wired ports, so you can keep your devices wired if you wish.
Setting up a wireless router is not much different from a wired one. The biggest difference is that you connect wireless routers and devices together using an encryption "key" that you create. This makes it secure. Once it's set up, you don't have to fuss with it again. It's an extra step, but fairly simple.