So I believe MS is the ONLY console maker BRAGGING about their online security, so how great do you think the other console's security will be? They'll probably leave that up to the developers and publishers to figure out. Sounds safe to me.
And designing games around peripherals has ALWAYS been a problem. I mean, WOW, Samba De Amigo and SEGA Fishing (whatever the name is) sold like HOT CAKES. Those shooting games built around light guns always tore up the sales charts too.
You could play those games without the peripheral, sure, but they were made for the peripheral and weren't as fun without them. Trouble is, casual gamers don't care if they need to buy Moraccas that they'll never use on another game. Once again, cost is prohibitive.
MS is not giving you a heyboard to prevent games that will be designed using it. I don't believe I heard Nintendo or Sony were coming out with one either (but I don't know for sure), so I think they are thinking the same thing too. Casual gamers don't want to use a keyboard, they want a controller. Bottom line. Thats why they play almost exclusively on consoles and not PC's, except for may be the occasional game of SNOOD or Minesweeper.