Your description of your situation is still pretty vague to me.
You should define stick better first. If you mean a USB stick for wireless networking, I'm quite sure you'd still need a router to access internet via your ISP. If you mean a stick for internet connection from a phone provider to hook up to internet by 3G-network, connections like those are usually limited and too expensive to enjoy SL.
If all your routers are gone at some point in time and you are just left with an empty RJ-45 socket, I'd advise using wired LAN.
ETA : Will your cable/ADSL modem ( which usually is the first router in your network and gateway to the internet ) disappear too ?