Perhaps there's a middle-ground solution - a universal prefix that denotes experimental or non-standard features that may be liable to break or not work cross-browser.

In the long-term (i.e. a major browser release), once the property is stable and has been standardised (or is a de-facto standard) then the prefix can be dropped.

This experimental prefix could exist side-by-side with vendor prefixes to allow for workarounds for broken draft implementations.