That would be a welcome feature for those who like to keep track of sentiment within the community. Reactions may be approximately as indicative of the prevalence of sentiment as are likes. However, admittedly, the various reactions available may differ regarding specifically what they tell us. For instance, a like or a rocket can rightly be regarded as a positive reaction, whereas a cry could mean disagreement with what has been written or could instead mean agreement with a post that identifies an existing problem.
I suspect it would be a bit unwieldy for the statistics to offer an itemization of counts among the different reactions, although some of us might find that quite interesting.