Potentially, 38 transponders. D10 14, D11 14, and D12 10 (6 are used for other purposes).
So what does this change the "potential" open slot count to? Which Sats have the hardware to handle the change? sounds like lots of new questions to be asked.
The key though is $, timing, and the state of D10.
New ground technology costs $, which will be weighed against the benefit.
Timing in that there's strong pressure to meet quarterly fiscal targets, and there have been mentions of recent belt tightening.
State of D10 in that there have been issues with D10 and bandwidth may be desired as backup.
Much goes into this.
And there's always the matter of contractual content agreements as well, that must stay within the quarterly financial targets.