Every coin has a day and same holds true for deflationary coins. But I have noticed that in current bull run there is not much moment in deflationary coins. May be they are waiting for desired no of coins to come into circulation after burning. So we have to wait for a while to see them in action.
You are very much right. If we do analysis of BOOM price chart there are couple of spikes but overall its going down or one may say its stable. So its a coin for long term investment, I dont think it will be effected by current bull run.