Shame, but I can't say I'm surprised. You could definitely notice the downward trend in the number of reviews and forum participation over the last three or so years. That site was invaluable to get me started on the quiet computing path after I have had enough of the golden/silver orb turbine noise. I also strongly believe that site was instrumental in pushing the silent movement along by working with hardware manufacturers such as Antec to put out high quality cases and providing feedback on what worked and what didn't.
However, a lot has changed since 2002 when the site has gone live. Hardware manufacturers put a lot more thought into quiet design now. Hell, even stock DELL PCs sold today are reasonably quiet, not quiet enough for me to use at home, but quiet enough that I do not notice them in the office setting. We have 90% efficient PSUs, cases that are actually designed to provide good airflow at minimum noise, aftermarket GPU coolers, excellent aftermarket heatpipe CPU coolers and SSD/5400 rpm green hard drives that are virtually silent inside the case, an abundance of 500-1200rpm fans, fan controlelrs, you name it. So it is really not surprising that the site was slowly dying for the last couple of years. It just isn't needed as much since quiet has become mainstream.
That said, SPCR reviews have always been top notch. It has absolutely the best methodology for testing heatsinks and power supplies. Nobody else tests heatsinks with a reference nexus fan or provides cooling comparisons at the same noise level. And who else besides SPCR has a silent chamber in the basement for noise measurements? The decibel measurements on every other site is a joke. I will definitely miss the quality of SPCR reviews when it's gone.