I also would like to mention here that Charan Singh, a former Indian prime minister, was an Arya Samaji.
Arya Samaj still has a presence in India and especially abroad. This is because of its acceptance of inter-caste and inter-religious marriages which orthodox Hindus frown upon but is not increasingly becoming a charecterestic of Hindu families.
Many foreigners also could become Hindu easily through the Arya Samaj, but which was not possible through other Hindu sects which considered foreigners as Mleccha or impure due to prejudice and looked down upon them. If at all other Hindu sects are showing flexibility in this regard now, it is because of the example of the Arya Samaj.
Arya Samaj greatly liberalised, secularized and humanized Hindu and Indian society, bringing great relief to women and oppressed sections of society. The Dalits and untouchables could now chant vedas as equals and perform havans, whereas in earlier times, they would have been killed or tortured for it simply due to casteist prejudices.
Same too with women who were denied an equal status in orthodox Hindu society, prevented from study of Vedas and subjected to widow burnings and lack of education or remarriage.
They also helped to simplify religion and get rid of many meaningless rituals performed by the priests which devoured valuable money and resources of the common people that could have been channeled to education and healthcare leading to social, intellectual and economic progress.
Instead of idols of gold and silver, they taught people to worship Om as God and that a simple picture containing Om is enough for worship.
Because of this, the Arya Samajis have faced opposition from various quarters then and now, as all this rocked their privileged position in society.
Swami Dayanand Saraswati was subjected to opposition and persecution by vested interests and stoned as well in public debates by prejudiced people who rejected his thoughts with aversion.
However he persisted with determination and brought about great changes in Hindu and Indian society.