What a great thread this has become, quality posts all. I personally feel that two things might happen: Reed will be traded in some package deal that involves Henry as well or Aiken is cut. While Aiken has the size and some talent, to be honest he has shown the least out of the three. Reed at least has a good season under his belt. Aiken has only shown the slightest glimmer when it actually matters: a regular season game. I don't see TD giving up on Reed until a new QB has had a chance to work with him. I also think that Smith has more play-making ability than Aiken does.
Aiken might be a better special teamer, but you do not keep a receiver just for that purpose over other guys. Surpluses at other position cans fill his spot on the kicking teams.