Theoretically the price should appreciate in the long term but in reality if there isn't any demand for the coin, it barely matters whether or not the coin's supply is deflationary.
That's just the truth.
I could be wrong but it doesn't seem like Void has a lot of adoption at the moment nor does it seem likely that it'll somehow gain a lot of adopters in the future. To capitalize off deflation, you need this demand coming from new adopters.
This is true with any crypto, any stock, any trade on earth, if it is trading goods, traditional stock market, the idea is to offload product for a better deal that what you gave for it. Being deflationary doesn't give it a new set of rules or make it any different. It is only a characteristic of the coin. The deflationary aspect wont really be much effect until most of the supply has been burned. People must understand the beauty of deflationaries will be when we no longer are able to use whole numbers but fractions this is where the 18 decimals will really start to show the capabilities.