I heard this question asked once, and thought I'd put it out here:
Was Jesus a Plan B? Was God seeing if humanity would be good, but since they didn't, Jesus was the alternative to what was supposed to happen?
Such a conclusion might fit where the Open View looks at God from.
Their erroneous notion is basically that God does not know the future and is therefore "open" to improvising His plans and purpose on the spot, as He goes along, in His response to how man responds to God's will for man.
But in Romans 1:17 - Romans 3:31, the Apostle Paul makes it really obvious that God allowed/has continued to allow man his various and ever endless failures towards His glorying in His Son as the ONLY solution to the fact that man is ever hopeless of continuing patient in well-doing, as God sees such well-doing.
Or as the Apostle Paul also notes in Galatians, an Epistle written with the intent of "correction" (2 Tim 3:16-17) of that aspect of one's understanding not in line with all that doctrine (teaching) laid out by him in Romans...
Galatians 3:21 Is the law then against the promises of God? God forbid: for if there had been a law given which could have given life, verily righteousness should have been by the law.
What then had been the purpose of all those thou shalt/shalt nots, and all that resulting witness of man's continued failures under the Law (the Old Testament)?
3:22 But the scripture hath concluded all under sin, that the promise by faith of Jesus Christ might be given to them that believe. 3:23 But before faith came, we were kept under the law, shut up unto the faith which should afterwards be revealed. 3:24 Wherefore the law was our schoolmaster to bring us unto Christ, that we might be justified by faith.
Anyway, yours was an excellent question. Hope the above shed some light on where to look at such questions from.
Rom. 5:6-8.