They can't remove ALL buttons, or how exactly would you wake the device? Would the touch-screen always be active? How then would you prevent the iPad's screen being activated by every single touch, including when it's in its case and touching the case's inside.
Not all changes are evolution, some just don't make sense. Which is why I think this rumour is inaccurate, or completely unfounded.
I'm not saying that we will lose all buttons tomorrow. I'm saying that the day will come and we WILL lose them. and when that time comes, technology will have evolved into ways of interacting with devices in new forms
and what I was trying to explain earlier is that the iPad is a really good contender to lose the button while the iPhone isn't. that's why Apple is "trying" to implement it on the iPad only. we're still in Beta, we might lose it before it sees the light.