Chabad’s replacement theology is actually a major obstacle to Moshiach coming.
Radical Chabad ideologues are actually attacking traditional Judaism, and attempting to replace it with a new religion of Chabadianity.
Chabad is not claiming Moshiach is near, or that a deceased person could become Moshiach in the future. Chabad is claiming there IS a Moshiach now, and he just happens to be the deceased Chabad rebbe. This is a con game to attract donations from well-meaning but misinformed Jews using a false messiah.
Chabad’s false messiah is a radical attack on the true Torah concept of Moshiach, who must be a living Jewish king in Jerusalem as per the Rambam’s 12th Principle.