Alton's demographic stability in terms of racial composition differs from national trends, which have generally shown increasing diversity in many urban and suburban areas. The modest income growth is below the national average for the same period, which saw more substantial increases in median household income in many parts of the country.

Based on observed trends, Alton is likely to maintain its "White Majority" status in the near future, but with a continued gradual increase in diversity. The growing "Two or More Races" category suggests that Alton may slowly transition towards a "Moderate Diversity" classification over the next decade or two, particularly if this trend accelerates or if there are increases in other minority populations.

The recent dip in median income after years of growth is concerning and warrants monitoring. If this trend continues, it could potentially lead to demographic shifts as residents seek economic opportunities elsewhere, potentially accelerating the diversity trend if lower-income groups become a larger proportion of the population.

Alton has remained relatively stable in its demographic makeup over the past decade. Subtle shifts and economic factors suggest a community in slow transition. The city may be moving towards greater diversity in the long term, but this process is occurring at a pace much slower than many other American cities.