Brewers current wRC+ is 87. If you swapped the 242 DH PA at 55 WRC+ for 242 DH PA at 100 wRC+, the Brewers team wRC+ would be about 92 so still not good at all.
DH is obviously a huge issue but it is far from the only issue.
C - 108 wRC+ (6th)
1B - 97 wRC+ (19th)
2B - 87 wRC+ (18th)
SS - 67 wRC+ (28th)
3B - 116 wRC+ (6th)
LF - 104 wRC+ (13th)
CF - 98 wRC+ (20th)
RF - 52 wRC+ (30th)
DH - 55 wRC+ (28th)
We are in the bottom 3 at 3 different positions and 2 of those positions are positions you are supposed to get excess offensive value from (DH and RF). I guess the silver lining is Tyrone, Winker, Voit, (and soon Turang) are not longer on the roster and they were the biggest culprits to the poor numbers at those positions.