If you are asking that question, you have not paid attention to what GM Martin Mayhew has done this offseason.
In the offseason, the Lions added free agent WR Nate Burleson, traded for TE Tony Scheffler, and drafted RB Jahvid Best.
Then consider that RB Kevin Smith and TE Brandon Pettigrew look fully recovered from their season-ending injuries and last year's free agency signing WR Bryant Johnson looks better than ever and you get a lot of weapons for Stafford to utilize.
And utilize them he has, while Calvin Johnson has the only two TD passes from Stafford in the preseason, Matt has done a masterful job of spreading the ball around.
Of course the main man is Calvin Johnson and all the work Stafford and Johnson did in this off-season is evident. Megatron seems re-energized and ready to take his rightful place among the very top of the WR food chain.
This duo could put up historic numbers and history will start this year. Remember that when Calvin Johnson is sitting there in the second round. If you don't take him somebody will get 1500 yards and 15 TDs out of a third round pick, and that could be a conservative estimate.
Another thing to consider is the type of running backs the Lions have. They are already using Best at times similar to how the Saints use Reggie Bush and Kevin Smith has always been great out of the backfield.
All those little dump off passes to Best with his 4.3 speed will rack up Stafford's passing totals.
What the running backs don't do well is play smash mouth football. Inside the 10 the Lions will be far more likely to pass the ball than try running the ball.
Of course that's great news if you want TD passes out of Stafford. With all those big weapons like Calvin, Scheffler, and Pettigrew 30 TD passes seem like a given.
Consider this, head coach Jim Schwartz has said many times that the team held Stafford back, his knowledge of the offense and skill level was beyond what the rest of the team could do.
That problem has been fixed.