The Bitcoin havling can be a good thing and a bad thing. For the people that want to buy bitcoins this is a good thing because the price will get halved so the coins get cheaper. If you want to sell this is less good news.
the price won't halve... the supply of BTC will halve. I doubt the price will go down, in fact, i believe the price will increase. Regardless, even if the price does decrease, it is not because the price will halve.