WI: A Different Compromise

What if instead of using the the parallel 36°30' north as the demarcation to limit slavery, the Missouri Compromise had instead set the northern border of Missouri as the demarcation line? Just by looking at the OTL map of the US, California, Utah, Nevada, New Mexico, Arizona, Colorado and Kansas would be considered slave states/territories if this were the case.
 
What if instead of using the the parallel 36°30' north as the demarcation to limit slavery, the Missouri Compromise had instead set the northern border of Missouri as the demarcation line? Just by looking at the OTL map of the US, California, Utah, Nevada, New Mexico, Arizona, Colorado and Kansas would be considered slave states/territories if this were the case.

Why would the North have accepted this? The idea OTL was to trade off the immediate evil of Missouri being a slave state in return for a favorable demarcation line.

Also, it was never entirely clear that the 36 30 line applied to after acquired territories like the Mexican Cession.
 
This is a major victory/wank for the slavocracy, and guarantees continued southern control of the US federal government. Abolitionism and free-soilism are going to get pushed to the sidelines and further radicalized, and likely merge with emerging socialist & anarchist movements.
 
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