The problem with the droids isn't that they are there.
It's that Lucas goes out of his way to give them dumb things to do to justify their presence.
Like I said in response to Ady saying he wants to remove C3P0 from all but ROTS.
Complete Threepio could be in the background and say little for all the Padme scenes on Coruscant and on her ships in every film (he doesn't have to be made by Anakin or have a stupid head swap in the Geonosian arena).
Artoo could fix the odd thing here and there but he doesn't need to play Curly to Kenobi and Anakin's, Larry and Moe on The Invisible Hand.
It's good to have a Greek Duet through the entire series of films.
Besides Artoo is a much better PT character than Anakin.