No, I don't believe that if the ban had been lifted earlier, blacks would've faced discimination in the church. Obviously, the ban prevented black men from having the priesthood, and black men and women from entering the temple, but it didn't prevent them from being baptised and being part of congregations. Also, I think that most members have always been loyal enough to the Prophet that when he comes out with a revelation, they accept it. For members to display racist behavior towards any other members, at any time, before or after the ban, would've been apostasy and sin in its purest form.
There isn't as much racial understanding in the church as I would like there to be. We hold back on exploring solutions to understanding the nature of the priesthood ban, dark skin as a punishement in Biblical/BoM times, the concept of God having a chosen people, and the plausiblity of natural selection giving a human population more individual characteristics over time. Sometimes we may even try to hide it.
How many times in the Bible is it been reiterated that the Hebrews were God's chosen people, and others were, to some degree, lacking the same, if any, capacity to achieve a spiritual relationship with God? It is made clear to us that the Lord does regard race in some way.
I encourage everyone in the church to heavily ponder and seek revelation to the topic of race. Its one of those things where you really have to be patient and have Faith that Heavenly Father will reveal to you the answers. It can't be taken lightly. You can't ignore it.
"In a world of deceit, telling the truth is a revolutionary act."
–George Orwell, 1984
"Ye shall know the truth, and the truth shall make you free"
"Facts do not cease to exist because they are ignored"
-Aldous Huxley, British novelist