Stripping out detail - it can be summed up this way
"Pride in one's birth"
E.g A working class Brahmin clerk finds it beneath his dignity to marry off his daughter to an OBC or Dalit multi-millionaire
So in that sense, Caste runs counter to materialism
That's the American creed
Caste kind of is antagonistic to that spirit
Once the acquisitive spirit triumphs over the pride in one's birth, caste is a thing of the past
There is this very strong urge to get ahead, among all sections of society
And with that will arise the temptation to "marry well"
As opposed to marrying someone with a similar "cultural and ethnic inheritance"
I think that's where caste will come under pressure. As it already has.