Many people taken advantage of this idea of future incarnation of God and try to link Hindu God to their religion. The next incarnation of Sri Bhagwan(God) is Kalki Avtar. This avtar will happen roughly in 400000 years from the start of Kaliyug. So far we have passed 5000+ years since age of Kali started. So future incarnation will happen long time from now. Until then there will be many changes in Dharmic way of life. False religions will rule the earth and corruption will grow and so on.
I will add more to this at a later time.