Another thing about 1984, as it was the USFL Stars moved, but now they likely stay and either the Breakers move to Baltimore and not Portland or some other club moves. If the USFL would just shrink to a manageable number of teams, they might move to the fall and have some success for a year with a city as big as Philadelphia. Because in 1987, the strike - if the NFL doesn't settle out of fear - could mean a still existing league which doesn't go the lawsuit route could throw all kinds of butterflies into the works.
Maybe they go to eight teams by 84 or 85 (when they go to fall in this world): Arizona Outlaws, Baltimore Breakers, Birmingham Stallions, Jacksonville Bulls, Memphis Showboats, Philadelphia Stars, New Jersey Generals, and Tampa Bay Bandits.
Then, in 1990, they add new expansion teams in St. Louis (Archers) and Los Angeles (Aztecs). Here is the USFL in this world circa 1990:
Independence Division: Arizona, Birmingham, Jacksonville, LA, Tampa Bay
Liberty Division: Baltimore, Memphis, New Jersey, Philadelphia, St. Louis
By 1994-95, though, I can see talks of a merger begin since they probably are taking some of the top college talent. As a result, the 1993 expansion (to CAR and JAX in OTL) is delayed.
1995 was a red-letter year for franchise movement in the NFL. In this alternate world, the league (as part of the merger) decides that they want to add the Baltimore Breakers team from the USFL, so they make Modell sell the team to Al Lerner and keep it in Cleveland (which is what they should have done).
Also, Bud Adams was getting ready to move the Oilers. However, a compromise was reached. The league decided to keep the Oilers in Houston (with Bob McNair as the new owner), and they let Adams either take over the Memphis Showboats or get an expansion team in Nashville (that's what he chose. They called the team the Tennessee Titans).
The other two cities added to the NFL would be the Carolina Panthers (expansion) and the St. Louis Archers (merger. As a result, the Rams find a way to stay in LA). That brings the league to 32 teams beginning in the 1997 season, and four division re-alignment happens five years earlier:
AFC East: Buffalo Bills, Miami Dolphins, New England Patriots, New York Jets
AFC North: Baltimore Breakers, Cincinnati Bengals, Cleveland Browns, Pittsburgh Steelers
AFC South: Houston Oilers, Indianapolis Colts, St. Louis Archers, Tennessee Titans
AFC West: Denver Broncos, Kansas City Chiefs, Oakland Raiders, San Diego Chargers
NFC East: Dallas Cowboys, New York Giants, Philadelphia Eagles, Washington Redskins
NFC North: Chicago Bears, Detroit Lions, Green Bay Packers, Minnesota Vikings
NFC South: Atlanta Falcons, Carolina Panthers, New Orleans Saints, Tampa Bay Buccaneeers
NFC West: Arizona Cardinals, Los Angeles Rams, San Francisco 49ers, Seattle Seahawks