I had never given this song much thought until I heard it on Pandora the other day while I was working. I grew up a Christian, and I immediately noticed what seemed to be references to Christianity. To me, this song seems to be about losing faith in what Christianity teaches. Allow me to explain,
verse by verse.

I am so high. I can hear heaven.
I am so high. I can hear heaven.

(this is most likely a drug reference, or just a feeling of elation)

No heaven, no heaven don't hear me.

(the writer feels God does not hear him)

And they say that a hero can save us.

(Christians believe that Jesus died to save us, and that upon His return, He will establish a new Earth, one without pain and suffering. Furthermore, we are commanded to wait upon the Lord)(Isaiah 40:31 But they that wait upon the LORD shall renew their strength; they shall mount up with wings as eagles...)

Im not gonna stand here and wait.

(the writer has decided not to wait)

I'll hold onto the wings of the eagles.
Watch as they all fly away.

(here the writer could be saying that he will join others who have decided not to wait, but to fly away)(eagles represent freedom, and everyone is choosing the freedom to fly away from old Christian teachings)

Someone told me love will all save us.

(This could be referring to God. God is love according to the Bible)

But how can that be, look what love gave us.

(God is also said to be the creator of the world)

A world full of killing, and blood-spilling

(here the writer feels God created a bad world)

That world never came.

(The writer was promised a new world when Christ returned. However, since Christ has yet to return, the writer states that world never came)

And they say that a hero can save us.
Im not gonna stand here and wait.
I'll hold onto the wings of the eagles.
Watch as they all fly away.

Now that the world isn't ending

(end time prophecies are the ones that state there will be a new Earth) (I saw a new heaven and a new earth; for the first heaven and the first earth had passed away, and the sea was no more Revelation 21:1)

It's love that I'm sending to you.

(the writer could be referring to sending out human love)

It isn't the love of a hero
And that's why I fear it won't do.

(the writer may be saying since it isn't God's love he's sending, it may not do)

And they say that a hero can save us.
I'm not gonna stand here and wait.
I'll hold onto the wings of the eagles.
Watch as they all fly away.

And they're watching us
(Watching Us)

(the masses are watching them as everyone chooses to be free from Christian teachings, and fly away)

As they all fly away.

I could be completely wrong, but this song really does not seem to be merely about a web slinging super hero. This song seems to be about losing faith in God, or at least in love.