there is lots of debate going on about the future of deflationary coins but one thing is very clear now after seeing the behavior of BOOM that deflationary tokens are here to stay. Its better to keep an eye on them to book your future profit.
We cant say this with certainty. If you see price chart of BOOM on CMC then its evident that there are only two spikes in last 3 months and since then price is continuously going down. You may invest some of your money in deflationary coins like BOOM but there are visible chances that your investment may hang up for a long time. DYOR before u make any decision.
We must buy a coin when it's at its bottom not at its peak but sadly we do reverse. That's y majority end up in loss. If you have faith in BOOM then its the time to accumulate boom rather then waiting for its ATH.