What program isn't a toy? Stop being opprobrious and come up with a better example.

It simply does not exist yet. There were no good airplanes before Orville and Wilbur showed up on the scene. I hope there will be some breakthroughs soon, but scientific discoveries can't be planned/scheduled, so who knows how long it'll be...

SHRDLU is nothing more than a really well-done ELIZA for a really small domain.

Why do you say it is just an Eliza?