Some people were waiting for the "free money" to come so they could buy "alt coins". Some will be happy to see BTC unchallenged. Price will be a balance of both.
After the announcement, the price dropped to $1, and has since rebounded to $200.
Maybe the $1000 BT2 price wasn't really a bet on free money, but on the prospect that BT2 might replace BTC.
If the expectation was that post-fork BTC + BT2 ~= today's BTC, that means that today's BTC price was depressed by this possibility.
Now that BT2 is cancelled, the value flows back to BTC.
The Chicago Mercantile Exchange says they'll start trading Bitcoin futures by year-end.