With possibility of trailing - in the URL? Can't say I like the looks of that. If it's the whole
element that is optional, it would have to be
If your url is in the form
then I honestly don't see where you've gained anything by changing formats. Especially for the increasing number of users who never even look at the URL and have no idea what you're talking about when you refer to the browser's address bar.
I don't always care for the "If it ain't broke don't fix it" line of thinking* but sometimes you gotta stop and consider it.
* Implying that there are only two possible states, "broke" and "not broke".