I disagree. All major browsers will support it within a couple months and any Bitcoin related software would just build the symbol in. Where else is it going to get much use? Microsoft Word?
Anyone using outdated browsers due to company requirements? Anyone using, for example, XP, which is fast losing browser support?
And yes, Word. Software people actually use. If you want your currency to succeed, you better hope that its symbol can be quickly and easily viewed by everyone.
And "a few months" is not really correct. Chrome 25 still doesn't support parts or all of the January 2012 version, released over a year ago.
Now you've just added another requirement for any site that wants to advertise Bitcoin acceptance using a symbol. Add in a @font-face, and you're all good to go.
How is this different than "add in <bitcoin image>"? It could be shortened to "include this script and it'll do it for you" - there are plenty of cases of that working. Google Analytics, for instance.