I don’t mean literally alphabetically but according to some objective measures. In the old days it was by incoming links (PageRank). But now it is opaque and many people are finding that it orders by whatever is best for Google, not for the user.
There is not nearly enough room on the front page for everyone that wants to be there, google has to make subjective decisions about what shows up there, it's impossible to do it any other way.
I don't think that's a bad idea, but the vast majority of google users would not desire this behavior, especially the way google is used today where users try specific terms to relocate content they have looked up before.