The Southern States would go more strongly conservative as fewer Democrats would be allowed to vote----and many Blue states would be less blue or actually turn red. Let's be honest here----The vast majority of non payers vote Democrat.
Your claim is that 90 percent of blacks vote Democrat and that it is a much lower percentage in other races. Let's take a look at federal income taxes paid by different races. This is not a race argument but will demonstrate using your 90 percent number that Democrats are easily the party that would include the bigger percentage of non payers.
---Yes there are many whites that don't pay a net positive federal income tax. No one with a net negative federal income tax should be allowed to vote regardless of race.
Blacks are only 12% of the population and are not the majority of of The Dem party.Only around 60% of blacks vote.