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.
I'll admit it, I was one of those people. On one hand, no "free money" for me, but on the other hand, I'm willing to accept this because it will hopefully lead to a stronger Bitcoin in the long run.
After the announcement, the price dropped to $1, and has since rebounded to $200.
https://imgur.com/a/XOvWS
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.