Unless, as has been argued, the use in Genesis of the phrase "these are the generations of"... or the "toledoths" is, in fact, the book of Genesis itself bearing witness of being multiple accounts in written form. It's very likely. Many Conservative, Bible-believing scholars understand it to be this way.
Henry Morris, hardly one looking for a "cop-out" to deny the inspiration of Scripture subscribed to, or at least highly regarded the theory.
It is not necessary (or even particularly Biblical) to assert that Moses simply copied the book of Genesis from rote dictation from God. In fact, I would argue, that the Biblical data implies otherwise.
It may "sound like a possible excuse" to weaken the inspiration of the book of Genesis to you, but, it isn't. It is a perfectly reasonable acceptable theory for anyone with a high view of Scripture and it's inspiration. It's not like that theory came straight from the pen of the Friedrich Schleiermacher's of the world.
You seem to be having a knee-jerk reaction to a theory which you think or fear opens the door to some form of Theological liberalism. Be at ease, this is not a Trojan Horse for liberalism.