Seriously, don't worry about this. Worry about problems that more than a miniscule fraction of people actually have. Catering to the 0.0001% of people who disable half their browser and then complain that the web stops working is a waste of time (and I like browsing in w3m as much as anyone).
I agree it's probably not worth spending much time on for most sites but I just get annoyed when the page is completely blank. It takes very little effort to stick a <noscript> tag on the landing page that contains a few paragraphs explaining what the site does and what services it offers. That at least gives me some information that I can use to decide whether or not I want to trust the site by allowing script execution.
