Who knows what will happen tomorrow? Directors come and go all the time.
Rothberg is staying on though as independent consultant:
"he will continue to serve as independent consultant to the Company, where he will provide advice and counsel on business development issues as they relate to Lotus' corporate governance and pharmaceutical pipeline."
I have no problem if someone resigned and moved on to a different company. But this guy stepped down from his Director position, but remains as an independent consultant with the company? That is a scary move! Sounds like to me that he still wants a piece of the pie, but he doesn't want any legal responsibility for his involvement.