Baseball does not have an advantage when it comes to number of scholarships. D1 baseball teams have less than 12 scholarships to hand out. Football is fully or nearly 1:1 scholarships per player and basketball isn't far behind that ratio.
Why then would a black kid who understands that he needs a scholarship to go to university pursue baseball over football or basketball? This massive gap in scholarships likely leads to more black kids playing basketball or football in university, not because it isn't fun.
Baseball will never have the demand of football or basketball at the national level, NCAA or professionally. The reality is D1 schools are reliant on football and basketball while baseball is closer to soccer in priority. An increase in scholarship allowance isn't going to just magically appear and without it baseball is never going to get kids to turn away from the NBA or the NFL.