Hajj is Fardh on a man, but he wants to go for Tabligh and postpone Hajj for the future.

Answer

If the man despite Hajj being Fardh on him abstains from Hajj and rather goes on a holiday whether it be for 'tabligh', then perhaps at heart he is a Yahudi or a Nasara. He is a vile rebel against Allah Ta'ala. His 'tabligh' will be a curse and a severe punishment for him. Allah Ta'ala is not interested in the so-called 'tabligh' of a Yahudi or a Nasaara. It is the incumbent obligation of the Tabligh Jamaat elders to ban such a 'Yahudi' from participating in their Tabligh activities. He must be ordered to first perform Hajj.