Here's how I'm thinking about the WR position for the Packers after the draft:
Sammy Watkins: Watkins is still a quality NFL starter when he's healthy (but that's the kicker-- availability). Last year, through four games, he was on pace for a 1,000 yard season. Then he got hurt, missed four weeks, and when he came back he was sharing the role with Rashod Bateman. But the ability is still there (which makes sense-- he hasn't turned 29 yet). I think Watkins will replace Adams in the sense that he will play all over the formation, and I suspect that he will be in the neighborhood of (on average) 4.5 receptions, 65 yards, and .5 touchdowns per game played-- for however many games that ends up being.
Allen Lazard: I think he continues to play his role. He could see a bump in targets just from Rodgers not hyper-targeting Adams, but I don't think he will have an expanded role in the offense. He is what he is: a power slot who does a lot of important dirty work for you as a blocker and who gets schemed open. He isn't a man coverage beater. I could envision something like 50/650/8 for him.
Randall Cobb: With Adams gone, I think that Cobb (and Aaron Jones) will replace a lot of what Rodgers wants to do in the quick game and will inherit some of those pure chemistry plays on 3rd down. He certainly isn't as good at it, but he's still an effective player in the short passing game. In a way, I'm glad he's on the roster because I think he will be good to have in the room, but I also lament it because I think they could use a better player in his role, but they aren't likely to carry two veteran slots who don't play teams.
Christian Watson: Watson's role will grow as fast as his performance, knowledge of the play book, and rapport with Rodgers allows. I think his floor as a rookie is slotting into MVS's vertical role in the offense. So ~4.5 deep targets per game. So if he stayed healthy, that would 77 targets on the season. A 55% catch rate (we're talking about a high ADOT) would mean something like 42/756/4-- something like that. And then of course there's the upshot that he comes along faster and does more.
Romeo Doubs: Like Watson, Doubs will have a role as fast as he can earn one. Working in his favor is that he's a punt returner, and I like him to win that job. That would mean he's active on game days, which allows him to earn the shot at playing time. I would think he would at least have St. Brown's role in the offense, but with more volume given that 170 Adams targets need to get shared out. Maybe something like 20/286/2?
Amari Rodgers: Rodgers is firmly on the roster bubble. The team is clearly making special teams an emphasis after how last season ended. If he isn't a viable returner, then he needs to cover kicks and punts. But if he gets beat out for that role, he needs to have taken a huge step forward as a receiver, because he simply did not look promising at all last season. You simply are not rostering a non-ST, sluggish, pure slot backup. I hope he shows progress, but don't be surprised if he's out.
Samori Toure: If Rodgers gets beat out, I am assuming it will be by Toure, who proved to be a good gunner in college and at the Shrine Game. The problem for him is that if Doubs is the PR guy, Toure would need them to have 6 WR's active on game day in order to see an opportunity. That could be tricky. If Rodgers shows progress and earns a spot, then it's the practice squad for him all the way.