A LOT of LPCM tracks are 48/16, as well. Nonetheless, yea, as a percentage of total number of discs, sure, 36%. However, I'm not buying every disc. It's used on a majority of discs I own, though.
As of right now, I have TMT2 131 installed side by side with TMT3 160. I've replaced the audio file in TMT2 to allow bit perfect LPCM. This gives me ReClock + bit perfect LPCM with my ATI card. No Xonar involved. Until TMT3 bitstreams (if ever) with my ATI card, this will be the solution I use on my main HTPC.