As others have mentioned, the largest concern with the CryENGINE V is the fear that Crytek might not be around long enough with their history of financial trouble. They can have the best engine in the world, but if developers don’t feel they can trust Crytek to still be around in a few years supporting the engine, Unreal and Unity will always be more appealing.
I personally love what Crytek is doing with their dynamic GI and their attempts to revamp some aspects of the engine that are notoriously user unfriendly, but there are aspects of it that still feel like it’s just not ready for most devs to start using when compared to its competition.
I’m not even certain how things would be handled if Crytek went under, maybe someone with more knowledge can enlighten me a bit. If Crytek shut down for any reason, what would even happen to those who are using the engine? Would the license still be valid with you being able to make and release a product, or would you need to start from scratch in a new engine regardless of how far along you are?