Evidently Khan has an inflated opinion of his own worth, the only countries that would have a noticeable effect would be Saudi and Dubai and can you really see either one risking their income by taking part in a trade boycott? All this would lead to is the stoppage of foreign aid and investment in the remaining countries to take part in this so who would really be worse off.
But perhaps we would consider it if in return you all pass laws to prohibit violence against innocents on the basis of religion but somehow I can't see that happening.
https://www.dailymail.co.uk/news/article-9516043/Pakistan-PM-boasts-plan-Muslim-countries-force-blasphemy-laws-West-work.html