Have been a huge fan of Nelson's since they drafted him, although I will admit I did want a CB during that draft and Flowers was available.
To answer your question Nelsons numbers won't be the same for a few reasons 1) Rodgers won't have as good of a year so as his stats go down so will his receivers. This brings me to my second point 2) the receiving corps is loaded (seems like it gets deeper every year) driver is the only one who will decline Jennings, Jones, and Finley will continue to get high targets and Cobb's numbers should greatly increase. With Gurley or Borel, or maybe both seeming like they will make the team targets will decrease for nelson. All of these factors will make Nelson's numbers lower than a year ago. I don't think being targeted more by the defense will make too much of a difference since we still have Jennings and Finley who require a lot of attention on their own.
With this being said I do not see Nelson's play going down. He is still very young and so versatile. IMO def a top 5 receiver, and def high then jennings. He has good hands, is a good route runner, has pretty good speed, and is a very unselfish individual all just like jennings. Unlike Jennings he is 6'3" and is very strong. Nelson is also different then most top end receivers in that he can lay special teams, return punts and kick-offs, and is a good blocking receiver. One thing that i have never seen him do is be able to go up and get the ball in a crowd.
If I was drafting receivers for my team my top 5 would look like this
1) Megatron (Calvin Johnson)- not even going to explain this one
2) Andre Johnson- Injuries are a little scary but just so productive over previous years is tough to ignore
3) Fitzgerald- look what he did when he had a legit QB throwing to him
4) Green- Mostly basing this one on potential
5) Nelson- Stated above why
Honorable Mention Welker, White, Jennings, Bowe
Maybe I am missing someone big but I do not believe I am.