The bitcoin halving is going to affect the supply but the effects are not going to be felt immediately, besides each halving is getting smaller so the effect on the market may even need more time to be felt than what happened in 2016, if anything I agree with the prediction, many are expecting a bullish year of 2020 not realizing this was the bullish year and most likely the next year will be one where not much happens except a slight decrease in the price of bitcoin.
Yeah, we can't predict how the market will go until entering the halving stage. so according to the schedule, it will start in May 2020. So bullish season we can see after that, until 2021. but for the price, everybody predicted, it will touch more than previous ATH.