Not true. The outstanding coins are not being halved, the rewards are being halved. So looking at it from a pure supply/demand perspective, it should take a long time to have any impact on the price. Of course it is not this simple, but I don't think it is as simple as the price doubling either.
Yup... you just need to look at the Bitcoin price before and after the reward halving in 2012 before halving: around $10 after halving: high on $1000 x)
And btw... next bitcoin reward halving will be in about 1 year
Is now the right moment to buy low Litecoin and Bitcoin???