Someone mentioned this about a month ago, but there may be something that Brewers brass is privy to that we are not.
If there is a lockout next year, then nobody on the 40-man roster can play. Players not on the 40-man can still play in the minors.
If that comes to fruition, then you lose a year of development for any young players who get put on the 40-man this year. Then it's 2020 all over again, losing playing time and momentum and then trying to restart in 2028 (hopefully).