The reason why we have good depth at WR, is because we have a solid starting group and young guys. Definition of depth. If you move all the young guys to DB, there is no long depth and in 3 years, we will have no one to play the position. Plus, you need 2 safeties on the field for a game and need 3-4 WR.
We have a solid group of starting receivers plus a solid group waiting behind them. Dixon would be a third stringer, if he was lucky, at WR. Whereas at safety he would be able to compete for playing time immeadiately. Our wide receivers are stacked on a great offense, we are hurting at safety on a weak, unproven defense. He is needed more at safety, he may start at WR but I wouldn't be surprised if he jumps to safety because of the lack of depth there.
After a redshirt year, you don't think he could compete for a back-up role in the slot? So let's look at his RS-soph year, there will be no Bell, Turner, Quincy, Wullenwaber. That leaves Alonzo Moore, Westerkamp, Allen, and a bunch of guys from small town Nebraska who realistically can only be expected to contribute on special teams.
That means you're relying on Moore (0 snaps in career), Westerkamp (0 snaps), Allen (2 career catches) to 100% hold down the WR position. Surely they will have a little more experience after 2 more years, but it wouldn't hurt to have Dixon in the mix to provide a little more certainty for the position going forward.
Gladney?