This is wrong, for two reasons.
First, you do lose something when you push a pick by a year: experience. Mark Ingram, next season, will have a year of NFL experience under his belt (less important for RBs than other positions, btw). The player NE (or, lets be honest, some other team) takes with the Saints first round pick next year will be a rookie, next season. You sacrifice a year of player development.
Seriously - think about it. When will Solder be more valuable to you guys: this year, or next year? Assuming there's no cap, would you trade Solder, next year, for a rookie with Solder's exact characteristics? Why not?
Second, you are talking like drafts have stable talent levels from year to year. They don't. This year was a very deep class, particularly at the top of the draft (many players carrying a true first round grade). So was last year. Next year may be very different; some years, the talent available after pick 15 is the equivalent of a second rounder.
Want an obvious example? You can make your same point about the NBA Draft - "A first overall pick next year doesn't get you less than a first overall pick this year. There is no natural inflation with draft picks. The 1st overall pick gets you the best player in the draft, no matter what year it is."
Makes sense, right?
Sure . . . until you realize that some years the best player in the draft is an Olajuwon, a Ewing, a Bird, a Lebron, or a Howard.
And in other years, you're the proud owner of Tyrus Thomas, Kenyon Martin, or Joe Smith