No, the military brass told Johnson and then Nixon that they could interdict the flow of men and supplies into South Viet Nam with airpower and that was simply not possible.
Sure you could always widen the war, but that wasn't what the brass hats were pushing.
The military could only operate under strict parameters so what they were pushing had to be within these parameters. N. Vietnam had to have everything shipped in and the US military was not allowed to stop the supplies at the source. Had these sources been been bombed out of existence the movement of NVA and equipment is moot.
Defense contractors told Johnson they wanted a war and Johnson said "if you want a war then by God I'll give you a war."
An unwinable war at that.