I now reflexively start typing smile.amazon.com instead of amazon.com into the url bar. Hopefully the smile url will continue to work because it's going to take me a while to unlearn.
I think it would bad PR if they just redirect to www, people that think they're still generating money for charity wouldn't be too happy once they figure it out. I've personally chosen Amazon Smile specifically because of the donations when there were plenty of other options I would rather use if I'm not getting anything out of buying from Amazon. I'm sure I wouldn't notice if it just redirected.
