Respectfully disagree... The Fourteenth Amendment, Section 1, guarantees equal protection under the law. The Tenth Amendment reserves police powers to which you refer as "...powers not delegated to the United States by the Constitution, nor prohibited by it to the States, ... reserved to the States respectively, or to the people."

Neither amendment supersedes the other. 

Nothing stops jury nullification now. However, the perceived transition (and distraction) from trial-penalty model to trial-income determination-penalty model might well provoke more jury nullification as jurors realize the Fourteenth Amendment appears to be arbitrarily suspended in order to enable indigent defendants to escape penalty for the same offenses that cost well-to-do offenders far more to resolve.

The value of forfeiture is that it offers a certain persuasion against repetition.