No, as a matter of fact, they haven't. Even though the position of Robert Schoch has changed, he doesn't deny that the Giza pyramids were built by dynastic Egypt; his view is that there is evidence that the location was chosen because of earlier structures there (the descending passage connects with the rest of the pyramid internals, but appears to be an unfinished, much earlier structure). This appears to be mostly an outgrowth of his geological analysis that there is water erosion on the Sphinx, part if its enclosure, and on the walls of Sphinx temple and Valley temple which stand out in front, but in part I believe this is due to his association with Bauval, who's just an occultist fringe writer.
Not sure what that response is in reference to, but if you're denying that closer inspections and analyses of Egypt's monuments has taken place over the last thirty years, I can assure you that they have. The books and documentaries on the subject are too numerous to mention.
In a nutshell, much of the physical evidence shows unmistakable traces of high tech machining - not just in Giza - but at sites all over Egypt. The tool marks don't lie. Whoever quarried, cut, and dressed the multi-ton blocks that make up the megalithic structures in Egypt, was using tools and methods that we in the twenty first century don't possess.
Those who are wedded to the mainstream theory must confront the fact that the traditional explanations have been proven inadequate.
We know what tools the ancients used to work stone, because they're recorded on papyrus and wall paintings, as well as being stored in museums. Those tools cannot work granite, diorite, andesite, and such, because they're softer than those materials. At minimum, it takes diamond to cut and finish stone as hard as that.
Some finished stones in these monuments are perfectly squared and polished to mirror smoothness. Modern measuring devices reveal that many of them are flat to within a couple thousandths of an inch. It's simply impossible to achieve that degree of precision using stone pounding balls and copper chisels.
Essentially, the mainstream theories of ancient monument construction fall apart upon close scrutiny of the physical evidence and logical inquiry.
In my view, we're missing a very large piece of the human story. Someone built those monuments using very advanced technology. I believe those people existed thousands of years before the dynastic Egyptians, and that they died out - most likely due to some major, worldwide cataclysm. Perhaps one day we'll find out who they were, and recover the missing chapters of our human story.