I’m harping on this, but it’s such a basic concept in American sports that you have to understand it to really understand how things work.
In America, a team in a non-Tier 1 league is always considered a provisional team, one you get because your city is not good enough to be a Tier 1 city, or failed to get a Tier 1 team because of historical accident.
If you have a Tier 2 team in your city and the Tier 1 league decides to grant you a franchise, the need for the Tier 2 team is ended. Nobody cares about it. Local loyalties will automatically switch to the new Tier 1 team.
This has happened in ever case in which a non-Tier 1 city became a Tier 1 city.
1953: The Boston Braves move to Milwaukee and become the Milwaukee Braves. No one misses the AAA team Milwaukee Brewers that were pushed out. When the Braves choose to leave in 1966, Milwaukee is upset, and remain unsatisfied until they get a new Major League Milwaukee Brewers in 1970.
1954: The St. Louis Browns move to Baltimore and become the Baltimore Orioles. No one misses the AAA Baltimore Orioles that wwere pushed out.
1955: The Philadelphia Athletics move to Kansas City and become the Kansas City Athletics. No one misses the AAA Kansas City Blues that were pushed out. However, when the Athletics choose to leave in 1968, a U.S. senator threatens Major League Baseball with disadvantageous legislation until they agree to grant a new major league franchise—the Kansas City Royals—in 1969.
1958: The New York Giants move to San Francisco and the Brooklyn Dodgers move to Los Angeles. No one misses the non-major league San Francisco Seals, the Los Angeles Angels, and Hollywood Stars that were pushed out. However, New York is up in arms until the New York Mets are granted the franchise in 1962. Los Angeles was considered a big enough market for two big-league clubs and a new Los Angeles Angels was created in 1961.
1961: The Washington Senators move to Minneapolis and become the Minnesota Twins, pushing out the Minneapolis Millers and the Saint Paul Saints. This one is kind of an outlier, because no one missed the Millers, but more than 30 years later, a AAA Saint Paul Saints was reincarnated. But in the Minneapolis-St. Paul region, the Twins and the Saints are not rivals of each other. You can be a fan of both clubs.
1966: The Milwaukee Braves move to Atlanta and become the Atlanta Braves. No one misses the AAA Atlanta Crackers that were pushed out.
1969: The Seattle Pilots are granted a new franchise, pushing out the AAA Seattle Rainiers, which no one misses. The franchise was a failure and moved to Milwaukee the next year. In 1977, Seattle is granted a new big-league team, the Seattle Mariners. A new major-league San Diego Padres push out the old AAA San Diego Padres.
And so on …