You got me wondering about this. It looks like Mercedes wants to preserve it. One can hope.....
From Wikipedia:
<span style="font-style: italic">Following several years of work by The Brooklands Society, which is entirely independent of the Brooklands Museum, the remaining sections of the track became the subject of preservation orders in 2002, rendering illegal any subsequent destruction of or damage to the circuit or its environs, whether intentional or unintentional. From 1990 to 2003 regular fly-ins, rallies attended by light aircraft, were arranged on summer weekends using the Northern half of the original runway. The central area of Brooklands including the hard runway and remaining racetrack was sold to DaimlerChrysler UK Retail in early 2004. A Mercedes-Benz museum and performance-demonstration centre is now completed in front of what is known as the Members' section of the remaining banking. Contrary to public perception and thanks entirely to the efforts of The Brooklands Society, two thirds of the original track still remains intact. Mercedes-Benz has pledged to contribute towards the replacement of the Hennebique Bridge, the part of the banking that spans the River Wey.Mercedes-Benz World opened to the public on 29 October 2006 and incorporates a test track.</span>