In an interpretive manner, "blood will have blood" is a double entendre. For, its first meaning is in reference to the predictions of the three witches who have told Banquo that his "blood" will have "blood" (sons)--"Thou shall get kings"--while the second meaning is that the shedding of Banquo's blood will have to lead (get) to the shedding of his sons blood as well because the prediction was that Banquo should be the father of kings.
When Macbeth utters these words, he uses the phrase more in this second meaning that his bloody path of murder must lead to other murders. Having killed Duncan and become king, he must now eliminate Banquo and his progeny to ensure that he remain king. This idea, too, is in line with the Elizabeth Chain of Being: whatever affects one thing affect others. Thus, there is an interconnection of one bloody deed and another. In fact, Macbeth even alludes to the sons of Duncan earlier with the word "bloody":
We hear out bloody cousins are bestow'd
In England andin Ireland, filling their hearers
with Strange invention. But of that tomorrow. (3.1)
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