In the mid 1800’s Dikduk with a basis of Nach was used too infiltrate the standard education of bochurim when emissaries of the enlightenment movement would pose as Talmudic instructors and prove their superiority and enlightenment too their impressionable prodigious students with the use of dikduk, and then send off their students unbeknown to their parents too universities claiming they were sending them too top yeshivahs of the time, (not too mention Mendelssohn who also infiltrated with his pirush al hatorah…) thus causing many, specifically chasidim too abolish the study of grammar and nach, and with time as chasidim and litvaks have rubbed off on each other for the good and bad the result is it’s struck out of the curriculum…