This is tacit sanctioning of the error. Postmillennialism is, at the very least, a legitimate option for Reformed Christians. It is, therefore, no wonder that these churches and ministers are unable to respond to the sharp attack on amillennialism by the postmillennialists. Much less can they take the offensive against the error. Postmillennialism wins by default.
Error carries the day because truth is kept from the field.
The notion of some amillennialists that amillennialism and postmillennialism are two valid options for Reformed Christians and that the silence of the amillennialists will result in amillennialism and postmillennialism dwelling together in blest accord is silly. The aggressive postmillennialists know better than this and intend, in fact, to wipe amillennialism out, root and branch. They have given the Reformed amillennialists fair warning. Either all are in error, or all but one is. It is always the task of Trinitarian theologians to discover what is biblically correct.