Personally I would think there are much safer short opportunities out there (coming from someone who has never shorted a stock). As has been proven, this late in the game big news can come out at any time. For shorting to basically take place April 21st seems like quite a gamble to me without significant upside on a stock that clearly has some devoted longs by now - unless there computer just spits out numbers to them and that is how they trade. I for one would see a high risk and only moderate reward on shorting this stock right now.
Now that's my common sense take on things - but I guess common sense does not always prevail.