I have to agree with not fearing change, but I also have to ask "why" would you not change the way something is done, but also leave the old way...
I really hope someone comes up with a tweak. For those of us like me who prefer competitors mice (ie me with my Logitech on my iMac), and don't buy into the whole swipe hype (ie me on my MacBook Air), I WANT the backspace to take me back a page. If it did something new I could understand replacing the usage, but it doesn't do anything now, so to take away the functionality will further annoy people (me), and alienate people who switch and expect there to be some generally accepted practices in web browsing (on a PC web browser backspace goes BACK just like it has for years)