What is the "so what factor" in this passage

Bring them before us.
To be thus is nothing,
But to be safely thus. Our fears in Banquo
Stick deep, and in his royalty of nature
Reigns that which would be feared. 'Tis much he dares,
And to that dauntless temper of his mind
He hath a wisdom that doth guide his valor
To act in safety. There is none but he
Whose being I do fear, and under him
My genius is rebuked, as it is said
Mark Antony’s was by Caesar. He chid the sisters
When first they put the name of king upon me
And bade them speak to him. Then, prophetlike,
They hailed him father to a line of kings.
Upon my head they placed a fruitless crown
And put a barren scepter in my grip,
Thence to be wrenched with an unlineal hand,
No son of mine succeeding. If ’t be so,"

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The "so what factor", is that Macbeth is beginning to kill everybody he thinks is in his way to staying king. Please note my earlier comment on this question.