My answer is no, but then I know I am by myself with not trading anyone over the next two years and trying to actually win 90+ games each year. Right now marginal wins are valuable, in three or four years when these prospects are ready, the Brewers may be struggling for that 75th win. And this is what these trades are, expected wins today for expected future wins. Right now there are only 7 or 8* teams trying to win in the NL. That is likely to change in the future as the Cubs and the Nationals are not going to sit on the sidelines forever. So strike when you have the most to gain and when wins have the most meaning. In two years, you let everyone walk, get a bunch of draft picks, trade Peralta and Ashby (if he has value), trade some of the younger players coming up now (Wiemer if still on the Brewers would make sense given his age and Chourio coming up. Another option would be Mitchell) and go from there.
*Well I think Colorado is also trying but in that special Colorado way which is panful to watch, so there is 9th team technically.