Litecoin generally is quite a good indicator of what we can expect for Bitcoin, so if we look at Litecoin's halving of a few months ago, it's safe to say that it hasn't done anything for it after the halving took place.

Litecoin's price went up significantly before the halving, but to give most of the gains back afterwards. I don't say we will see the same happen to Bitcoin, but if there is no short term demand, things won't look as pretty.

Bitcoin's price is higher than ever before in the run-up to a block halving, so there is much more economical mass to move up, which isn't going to be an easy task at all, especially when it comes to +$20k levels people are speculating about.