Someone recently posited a theory that really stood out to me: when a better version of a board game comes along, the old one simply becomes obsolete. The game that they were referring to in particular was Secret Hitler, which they felt obsoleted Werewolf and The Resistance.
When I have an opportunity to play board games with people I will always want to play something that I think is fun, exciting, or new. Monopoly is none of those things to me. For some people it probably endures primarily out of nostalgia, or a lack of interest in other options, but there are so many better options for new board game players.