Bitcoin is not unstable due to halving actually halving process to limit the overall supply only.  Halving should cause increase in price only not the downward turn. It is unstable because community is governed by the "HODL" principle. Very basic requirement of currency is that it should circulate and widely accepted, easy to transact and not counterfeit.

Unfortunately in current scenario , community instead of creating business (that will involve transaction of currency) believes in locking it.

PS: Stop blaming Satoshi ,he is not asking to dump the coin or spike the price.