It's a great question and I'm not quite sure where I stand. In all honesty, I don't check as many old browsers as I should and since Firefox 3 came along, I haven't so much as even looked at two.
My initial feeling with the 'old' versions of 'decent' browsers is that if people are savvy enough to know they should be using a better browser, they are probably most likely to be keen on updating it. It then becomes the issue of people using old 'bad' browsers such as IE which we can target so it doesn't matter much.
I know I could be doing a lot more testing wise, I just haven't gotten around to implementing a decent structure as I just by with current practice and haven't taken the time to improve. So, I think we should care but I don't know how much and I don't know how much I care myself.
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