You have to realize, ESPN doesn't care about FSU or Clemson. If they whither, they tell the story of the one-time great program and they use the remaining fan-base to fill out secondary network time-slots... filling the prime time slots with SEC teams whom they already own.
They aren't going to move into an arrangement where they pay more than twice the value for 13 other properties (counting Notre Dame's partial share); to double the pay for 2 particular properties... whose rights they already own, it's bad business... to those same bean-counters. They will pay an absurd price for the NBA soon, the premium properties will continue to get dollars, but they aren't going to compete against themselves to pay a premium for two good college football programs.
Plus looking near term, what's more valuable for ESPN? Florida State or Clemson becoming just another program in an SEC that's already stacked? Adding more losses to the potentially premium properties. Casual fans tune into premium/blue blood/dynasty programs. FSU or Clemson as perennial 10+ win teams; conference champions in the playoffs draws a bigger number than FSU or Clemson as 4th team out of the SEC with a 9-3 mark. The argument seems to be predicated that FSU/Clemson have far more value as just another SEC team?
Disney's not worried about developing FSU or Clemson. Nor are they worried if they fall off before they'd be available to the SEC. They are worried about driving ratings now, they'll figure out 2028, 2030, 2035 when they get there. FSU - LSU drives a number as an interconference attraction and can be arranged in premium spots with little competition (like the season opening Sunday night) where it's special and a loss for FSU means they might finish 12-1 before the playoff instead of 13-0. FSU - LSU week 7 is another SEC regular season game (albeit a nice one). It has significantly more competition than that season kickoff and features 4-2 LSU vs. 5-1 FSU. By the end of the season that FSU property that looked great in the playoff as a seed protected ACC champ at 13-1; is the 8-seeded seminoles at 9-3. That 8-9 matchup against the Pac-12 champion or heaven forbid a 9-3 Iowa team; is much less valuable.
FSU & Clemson fans are twisting themselves in knots worried about how they stay competitive financially for the next decade (much the way UConn fans have) and have convinced themselves that ESPN/Disney care specifically about the value of their programs long-term. They don't. They aren't going to invest in paying FSU/Clemson more to prop up what would be mid-tier value SEC properties; while then dramatically overpaying the remaining ACC teams to stave off lawsuits. They'll continue to leverage FSU and Clemson's current value, hope the two schools figure it out and worry about the rest when they get there.