SMIL has simple ways of handling this sort of thing
including with timers for menu deactivation that degrade very easily to browser that don't support it (and could probably have a script fallback for applicable cases).
To be honest, I think it's going a bit too far dragging out SMIL (or rather IE's incompatible HTML+TIME) for what is essentially something that can be achieved with just a touch of CSS and javascript. Native support for SMIL/HTML+TIME across browsers is quite bad, so it would be an exercise in futility, in my humble opinion...
And yes, you can make something that degrades very easily with javascript off / css off as well.
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