There is a right way and a wrong way to convert a Jehovah's Witness to Christianity. Most people talk to Jehovah's Witnesses the wrong way and simply waste their time. Then they give up thinking there's no hope.
Yes there is hope for all Jehovah's Witnesses. They are leaving their organization in droves and some are looking for true Christianity.
The biggest obstacle is their religious programming. When they leave, they tend to take all their religious beliefs with them especially if they were raised a Jehovah's Witness and it's all they know.
However if you have the patience and compassion for people, you can help a Jehovah's Witness to find Jesus and the true path to salvation. All you need is the right attitude and a good understanding of what Jehovah's Witnesses believe in.