Some conferences are really going to take a hit when their next media rights contracts are signed.
Conference USA has had almost a complete member turnover, as the majority of its members weren't even FBS schools the last time they signed a media rights contract. The next contract will easily be the lowest of any G6 conference.
The American's current contract, top among the G6, was signed when the conference had Cincinnati, Houston, UCF, and SMU as members. Losing those schools and replacing them with the CUSA callups negatively effects what they will receive in the next contract, but very well could remain higher than the PAC 12 for the top G6 conference.
The Sun Belt has made some additions that may increase its value in its next contract. Likely the fourth most valuable P6 conference, unless it can surpass the new Mountain West.
The MAC may see a slight increase with the additions of the UMass and Sacramento markets, but not as much of a bump as the Sun Belt. Value is fifth of the six P6 conferences.
The PAC-12 just signed a new contract worth the true value of its new members. Not as much as they thought they were worth, but still second best in the P6 (and it might surpass the American depending on the negative impact the American will see with the loss of 4 schools to the P4 in its next contract).
The Mountain West also recently signed a new contract worth the true value of its new members. I don't think the financials have been disclosed publicly, so that isn't a good sign. Likely the third most valuable P6 conference.