There is now "sufficient evidence for a realistic prospect of conviction" of PC Alex MacFarlane, a Crown Prosecution Service review concluded.
Lawyers studied footage appearing to show the officer say to a 21-year-old black man: "The problem with you is you will always be a n*****, yeah?".
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Cressida Dick said that around £700m of savings have already been made.
Tourists have been left scratching their head after the surprise announcement of the closure of the world's largest museum of oddities.
Scores of RMT union members will vote in the coming weeks on whether to launch a campaign of action.