I am confident that these guys are not going anywhere and this product will be around and developed for a very long time.
You should check their history with their other product called Quotetracker, which was bought out by Ameritrade. Their level of support and persistence should give you an indication of their commitment to support and development.
Again, I am confident that you will keep seeing development and maintenance of this product for a long time.
BTW... I signed up for the beta releases which come very often. You can sign up for beta releases ...