Why would I want the price to remain the same? Because everyone needs to plan financially. You need to estimate your future income and your future expenses and make sure the one covers the other.
Prices falling benefits the spender but for every spender there is an earner somewhere. I don't know how you earn, maybe you earn wages, if wages, the price for your labor, is prone to fall in the future, you have to reduce your economic activity.
The only way an economy gets going is through price stability.