I think there is a lot of disbelief among JWs at the moment. Recent conversations I have had surprise me how much many JWs question these days. I think JWs are in a pretty vulnerable position right now. A few factors leading to increased doubts: bad publicity over abuse; stupid doctrinal changes such as overlapping generation; the GB making fools of themselves on the TV; many indications of organisational decline; 1914 getting more and more incredible with passage of time; increasing numbers of anointed when they should be going down; lack of substance to meetings and magazines these days; and, not to be underestimated: the secularising trend in society in general having its effect on JWs.
Having said all that, I think it's worth bearing in mind that belief/disbelief are not often, if ever, discrete binaries. I feel this anyway, in relation to myself: that I have experienced a variety of stages between belief and doubt, and one side never fully succeeds in defeating the other. It's true that JWs may more frequently have doubts these days. Unbelievers can also have their "doubts". It's a strange person who doesn't, no matter what their ideological position.