As your own comment indicates few Jewish scholars have explored or developed a theology of the New Covenant the New Covenant is simply not an issue in Jewish messianism as such When that bit of Jeremiah is discussed in Jewish dialogue it is never as far as I know with the nomenclature New Covenant Even if it is true that that is the appropriate term and that it is an important issue in Jewish messianism in the absence of serious citation otherwise it would seem to me to be original research Neither the term nor the link to the article therefore have a place in an article on Jewish messanism except as a compare and contrast with the Christian notion s By the way keeping in mind that Wikipedia is not a forum you are mistaken about converts to Judaism See our article on the topic