There is no difference in allowing more than restricting. Allowing dwarves to become paladins also worked for a while.
If a power is designed to make simple weapons good enough, it may be unbalanced for other types of weapons. There are enough powers out there for such clerics. (Righteous brand e.g.)
One of the new options only encourages using simple weapons, as it only adds 1d6 to the roll. And it is still a great option with a +2 shield bonus as an effect, even if it only gives +1d6 damage with simple weapons.
I really can´t see the problem here...
If you like full blade wielding rogues in your game, by all means, let him take them. But don´t make it the default playstyle...
Rogues actually beeing encouraged to stay with the dagger was one of the things I liked most in the initial design.
Really, making restrictions is as valid as making none. Someone has to houserule if it is not to the liking of the group. And it is more easy to allow more later than to balance all possibilities.
If you have a different opinion, so be it, you can´t change mine. And I hope the power does not change.
If an eladrin could actuall use the first power with his great spear the power may actually be too good.