Carl, this is a user forum, staff members only occasionally pop in.
I am totally confident that the Adobe Captivate team will be ready when Flash player is removed, have more concerns about companies realizing too late that old courses are no longer playing as expected. I hope you did read this article by Akshay Bharadwaj:
In the Captivate environment at this moment for normal projects, several Preview methods do use a temporary generated SWF. Probably in a near future this will no longer be the case. Already for responsive projects none of the Preview methods need Flash player, so you shouldn't worry about that. Publishing to exe or to interactive pdf needs Flash as well, have no idea if there will be a replacement or not.
Thank you very much for this reply.
It's given us a lot to think about.
Wanted to add another comment, because there is a lot of misunderstanding about 'Flash will be or is dead', which is not correct. Flash player will be EOL, but Flash itself is very much alive, probably the most important tool for gaming and interactive animtations. The name 'Flash Builder', because of the negative 'sound' since that fruilt company condemned it, has been replaced by Animate CC. You can create Flash output and HTML5 output with Animate CC. Look at this poster: