My initial thoughts are that the announced ending of the AH in March of '14 will cause a spike - knee jerk - rise in prices, especially of commodities.
3:20PM 9/17: The average cost of Rad Star gems has risen about 30% in 40 minutes.
Next, there will be a drop in prices as people realize March is 6 months away.
EDIT: 9/18 6:49PM - The market in general has corrected to pre-ish (depending on gem level) AH shut down prices.
After that, there will begin a steady, rising climb in the cost of..well...everything. The only thing that will keep this climb hedged is the impending knowledge of Loot 2.0 and RoS. The, "should I buy any upgrades?" question will steadily slide over to, "Nahhh - I'll just wait for XPAC/2.0" with each and every passing day. Could serve as a psychological correction against the tide of "no more availability".
But! That may not happen at all, right?
People may dump gear in a "SELL! SELL! SELL!" panic from now until March. I'd expect pretty amazing gear for sale at reasonable prices more often.
What an interesting spin on the 'ole, "Supply an Demand" model, amirite? Normally, when supply goes down, and demand remains the same...prices rise. What happens when the method of delivering that supply is given a death date? I'm guessing that it's sort of the same as the "supply going down."
There were signs - arguably - and as usual, sigh, I missed them :(
Loot 2.0 - Smart Drops.. Use AH less!
The Mystic - Re Roll then BOA an item - Use AH less! Can't put it up for sale on AH anyway!
Battling the Gold Farmer - your move Gold Farmers, your move. Having multi beez ain't that important if I don't know how to source the gear, now is it?
So much to think about!