While better packages are certainly out there with younger stars, Brown is still young enough and has made enough of a name for himself the past few seasons that I think he could work as a centerpiece. Remember, Milwaukee is a small market team that is just as interested at staying relevant/competitive and putting butts in the seat as they are doing a true tear down and rebuild for the future, especially given that they don't really have and/or control their picks for the next four years. So bottoming out doesn't necessarily make them better now.
Something built around Brown, Hugo, and 2-3 1st round picks/swaps would likely be able to get it done in the summer, and give them a replacement marketable star, a burgeoning two-way prospect, and draft capital with possible potential, though I'm not sure if he will last that long past the deadline. If we were confident in Giannis' health and Tatum coming back in February/March, I'd possibly be interested in a bigger deal at the deadline to fill multiple needs, something like:
Boston: Giannis, Turner, Trent Jr.
Milwaukee: Brown, Simons, Hugo, 2030 1st, 2031 1st Swap, 2032 1st
That'd leave us with the following lineup:
PG: PP, Trent Jr.
SG: White, Scheierman
SF: Tatum, Hauser, Walsh
PF: Giannis, Garza
C: Turner, Queta, Amari
Still not sure I would do that for several reasons. First, JB has earned some loyalty, and while this would give him his own team to serve as the primary star of, I'm not sure how thrilled he be about this. Second, I'm not sure about Giannis' injury history and how well he will age. Third, Tatum is best suited (especially post-injury) as a long-term 4, which is the same spot as Giannis. Can they coexist together well enough to make it work on both ends? It does bring some *enticing* small ball possibilities, but you'd ideally want to see how Tatum looks coming back first before making that kind of move.