What's the downside? Millions of dollars that could be better spent on fresh talent creating something original?
The original Blues Brothers was true lightning in a bottle cinema just like Ghostbusters, realised at a time when soul and blues were actually still big genres and in the mainstream consciousness enough that you could feature the likes of John Lee Hooker and expect some portion of the audience to have a clue who he is. On top of that you've got James Brown, Aretha Franklin, Ray Charles, etc all closer to their prime and, you know, still alive. What the **** do today's twentysomethings know about blues? Who's gonna be the big star cameos in this one? Rihanna? Beyonce? Katy Perry?
Mainstream music is saturated and infested with pop, "RnB" and hip-hop garbage. We live in a time where pop artists like Taylor flippin' Swift can actually get away with marketing themselves as Rock stars if they just add a bit of guitar to their latest autotuned, anodyne hit. Musical genres have basically been eroded to the point of meaning nothing. So what are the options for the studio creating a new generation of Blues Brothers? Aim it at the yoof and have a hit with the likes of Ed Sheeran trying to cover Mustang Sally and murdering it, or you can aim it at the older generation and produce something with integrity but it will bomb harder than Blues Brothers 2000. And who exactly are going to be the new Blues Sisters? The original duo started off as a stand up act from two die-hard Blues fans. What actresses/comediennes are famous for being huge Blues aficionados? Are they just gonna lump Kristen Wiig and Melissa McCarthy together again and hope they can collectively queef out some form of musical authenticity?