Right now demand is keeping up with the supply. Hence the stability.
Resolve the block issue and the demand will be greater than the current supply.
Cut the supply in half and the demand will be far greater than the supply.
Face reality that there are not that many Bitcoin left to enter circulation, and demand will skyrocket.
I agree that the halving will create a self perpetuating snowball effect from the buying pressure.
Another word for "self perpetuating snowball effect" is "bubble". Bubbles pop.