To make it clear, I believe prices in the general market (not high end) will drop another 15 to 20% nominally over the next 3 years followed by flat prices for another 3 to 5 years. There will also be price erosion in Real terms due to inflation amounting to another 20 to 30% decline (3% annually over 6 to 10 years). I have seen a nominal decline about 10% from the peak in late 2004/early 2005 already.
With a 30% nominal decline and a 20 to 30% decline (over 10 years of falling then flat prices) due to inflation, Real Prices will be be at least 50% below the peak. This of course is just my opinion.