Not flood. Also, no. Not a thing will happen for the average end-user. It
depends on your ISP, not you. You won't have to keep your router on(, or worry about your free porn).
At all. Cheer up. In the worst case, you'll have to get a new router/wait for your ISP to provide you
one when that time comes.
Well, unless you're still running Windows 3.1, of course. You're pretty much screwed then.