Baha'is await an hour when 'mass conversion' will occur and all nations and races will accept Baha'ism.

This flow (of reinforcements), moreover, will presage and hasten the advent of the day which, as prophesied by `Abdu'l-Bahá, will witness the entry by troops of peoples of divers nations and races into the Bahá'í world--a day which, viewed in its proper perspective, will be the prelude to that long-awaited hour when a mass conversion on the part of these same nations and races, and as a direct result of a chain of events, momentous and possibly catastrophic in nature, and which cannot as yet be even dimly visualized, will suddenly revolutionize the fortunes of the Faith, derange the equilibrium of the world, and reinforce a thousandfold the numerical strength as well as the material power and the spiritual authority of the Faith of Bahá'u'lláh.

(Citadel of Faith. A collection of messages from Shoghi Effendi to the Bahá'ís of the United States, written between 1947 and 1957)

http://www.ibiblio.org/Bahai/Texts/EN/CF/CF-103.html