Maybe, maybe not. The problem as Obi identified it is that damages can only be measured from the point when warrant exercise occured. So a Takings claim would be based on the share price decline after such an event is confirmed.
If warrants are exercised while shares trade at around $2, damages would be computed on the downward reaction from there. Simple math says $1.40 per share, max potential in a 100% successful litigation. Is that worth engaging a $multi-M plaintiff legal bill? Pretty doubtful.
I'm not an intentional Debbie Downer on this, just explaining how Obi changed my mind when I was personally threatening to sue, myself, over warrants.