I hope you're aware the move to the blue the VDG request at the time too. We need to be careful we're not treating the user's desktop as some sort of experimental playground for flip-flopping about indecisively on.
But ultimately, sure. One technical objection: Unless there's a significant change of default wallpaper style, it'll be undreadable unless we also bring back the black banners that were also there in the original lockscreen when we used the wallpaper. But I liked those anyway, so that's easily solved. David