Dilution of the Fourth Amendment

Has the fourth amendment been diluted in recent years? Julian Sanchez, writing at the CATO blog,  thinks so, for a variety of reasons. William Pitt famously defended the sanctity of the home thusly: "The poorest man may in his cottage bid defiance to all the forces of the Crown. It may be frail — its roof may shake — the wind may blow through it — the storm may enter — the rain may enter — but the King of England cannot enter — all his force dares not cross the threshold of the ruined tenement!"
Things are different nowadays. Read more here:  http://www.cato-at-liberty.org/class-and-the-fourth-amendment/#more-52601