A damn shame. Jordy is phenomenal. Luckily (for Packers fans), the Pack has a stellar track record for WR depth. This year is no different. Nelson will be missed, but this isn't a season-ruiner. Adams has a similar but less refined skill set. Because of that, his role should greatly increase. Hopefully he's ready for that responsibility. Cobb will continue to do Cobb things. WR3 will be a battle to see who steps up out of Montgomery, Janis, and White (my money is on Janis even though Montgomery looked better). They still have Lacy, and their quarterback is pretty good by all accounts.
Impact: This has significant impact. Obviously one of the top rated wide receivers will miss the entire season, but this immediately makes Davante Adams' stock skyrocket as he would be in line to fill in for Nelson. Randall Cobb could see a bump in production as someone has to make up for the 98 receptions Nelson had in 2014.
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