As the old saying goes it takes two to tango. With Burnes it is just not an option for the Brewers to extend him with Yelich on the team. It is just not financially possible for the Brewers to do this. Adames is probably looking at a Baez or Swanson type of a deal. Not all that unreasonable but not someone I would want the Brewers to lock up long term.
Look I know there are plenty of people who want to see the Brewers to lock up the players they have but I don't think it is necessary to do so especially for ones so close to FA. Chourio, Wiemer, Mitchell, Turang and Frelick sure offer extension for them and even see if the Brewers could extend Contreras.
Woodruff I would wait until he comes back and see if he is the same if he is then sign him to an extension if he is willing to sign one that is reasonable.
I would also look at giving Anderson an extension maybe buy out one or two years of FA. Something like an extension of 2-years $14.5m for Anderson with a mutual option of $8m for a third year. Tellez is another player the Brewers could extend cheaply but I am not sure they should. Basically the players the Brewers could extend are scraping the bottom of the barrel or younger players.
I am more of the mindset of if you can't extend the players within their first or second year in MLB then it is best to just go year to year. After year 2 the player gets closer to FA and it will cost the team closer to FA money.