Moses Move

a polarzing/definitive decision or move ; that "parts the Seas" and divides people into friends vs enemies, interested vs not-interested (romantically) or generally splits a situation into decision tree, generally with two likely outcomes- yes or no, a or b, with little middle ground to negotiate.

If we discontine the ad campaign of X and give Y full run of the site and it doesnt work out for Y, we may never be able to get X back so we should be cautious, it's a Moses Move for sure.