Anyone want to guess the medium term price trends for a C-150?
By medium term I mean the next five-ish years.

My guess would be "more of the same" meaning increases of a few
percent a year with mild year-to-year variations.

The only effects I can see are whatever's left of the upward bounce-back
from the 9-11 price drops, any price drops that might occur becuase of
the current political trends against general aviation, and the possible
coming influx of "Sport Light Airplanes".