I don't know the details, but weren't a lot of people saying we had to make a choice to keep Favors or Hill financially?
Obviously, Millsap might not be the answer right now, given he is a UFA, but you have to start looking at Favors trades this year. Even if he's healthy, there is a chance we don't get to keep him due to financials. His value might not be high now, but I think it is likely that whatever value he gains from being healthier, he loses in becoming an expiring next season. If you're talking about wanting to be better for the 2018 season, then there might be value in getting a player now, and letting him develop chemistry over the remainder of the year so he integrates better next year.
Again, a lot of this hinges on whether there is a good trade to be found for favors, and you definitely want to keep him over selling him for pennies on a quarter (since Favors isn't at his peak value right now anyhow). Still, I think you have to at least start thinking about it.