Honestly I'm not sure why people are guaranteeing a box office flop.
Sing and Boss Baby didn't succeed because of marketing, but because of timing and families needing a kids film to see regardless. Also I don't know why you're thinking Hasbro is dirt cheap and can't market this correctly. Stop using Disney as a benchmark. They've made numerous flops even with their so called "great" marketing.
And I know people are using the Blade Runner 2049 argument but the fact that Alien Covenant, a more well known franchise, didn't do that well at the box office, which shows tha R-rated films aren't as profitable as you think unless it's X-Men.