Bryant was basically the number 2 WR, already. He was drawing double teams, and teams feared him. Teams talked about fearing him this season. Next season, Bryant will match his numbers (+ the missed games numbers) and eat up a significant amount of Roy Williams' numbers. Dallas will consider this when they factor in paying Williams big money, for being a role player.
I guarantee you, you will never see Bryant return another kickoff in his career. It's simply too dangerous for blue-chip players like Bryant.
People will talk about "injury prone". Football is a rough sport, and both his major ankle injuries could have been avoided. Kickoffs are dangerous. There is a reason why you have designated special teams guys doing it.