Whoever loses game 7 will be in shambles. If the Leafs lose, heads will roll, (Shanny, Keefe & coaching staff, Marner, etc). If Boston loses, that will be 7 straight potential clinching games that they will have lost in a row, including two 3-1 series leads blown in a row (never done before in North American sports).
It's gonna be a bad scene for one of these organizations.