Bitcoin will moon but I think its more likely to be as a result of diminishing supply after the halvening.
Block reward is going to be halved. The halving is about the rewards not the supply which remains unchanged.
Edit: Pretty sure you know this and this is just about semantics
That is a fair clarification, even though surely LFC has been around the bitcoin block a sufficient number of times to know that the upcoming halvening (as well as other BTC havenings) is about reductions ("diminishing") in the amounts of new supply rather than affecting existing supply.
Further, even when BTC's supply schedule is known out to 2140 and beyond (absent some kind of consensus to change the supply), the halvenings have "hard effects" that folks can claim are "priced in", yet the reality of the diminished quantities of new supply have tended (and not likely to change) to force hard effects in BTC's price to rise, whether the powers that be or traditional financial players want such hard effects.
Bitcoins become more rare after every halving.
Miners get less coins per block mined. Miners sell bitcoins for profit & obviously to cover costs. I could be wrong as there are lots of factors that decide how many people are selling how many coins at specific times (namely price).
I always think though that after every halving there are less coins available on exchanges. Miners have less to sell naturally.
Supply & demand.
Theres a reason why the price usually soars 6-12 months after each halving.