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The reason we're changing to a 12-team playoff:
CFP Records by conference:
16-5  SEC  (14-3, if you remove SEC v. SEC)
6-5    ACC
3-5    B1G
1-1    PAC
1-4    B12
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So we couldn't continue with the BCS because of the all-SEC rematch in 2011.
Now we can't continue with the 4-team CFP because of SEC dominance*.
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I'll give you one guess what's going to happen in the 12-team playoff.  Hint:  history repeats itself.
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*before you say it's all Bama-Bama-Bama, consider this:  the SEC's wins are by 3 different schools, yet all of the other conference's wins are by 1 individual school (Clemson, OSU, Oregon, TCU). 

Ed Zachery

and the SEC is gonna cash in like no other

In the BCSNCG, the SEC had 2 losses.....but just 1 to itself.
8-2 SEC (really 7-1)
2-4 B12
1-3 Big East
2-2 ACC
1-2 B1G
1-2 PAC
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Again, it's not just Bama-Bama-Bama here, with 4 different SEC schools winning NCs in this era.  That's basically unprecedented depth.  And this isn't me chanting SEC-SEC-SEC, either.  I could be a Boise State fan and still marvel at the facts.
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A certain conference dominates the 2-team playoff, the rest of the country pouts, and moves the goalposts.  That same certain conference dominates the 4-team playoff, the rest of the country pouts, and now we have a 12-team playoff.
Guess what?  The SEC is going to have 3 or 4 or 5 teams in it, and they won't be among the worst ones in.  Regardless of seeding, if 4 SEC teams make it, they'll likely be among the top 6-7 teams in actuality. 
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It's like your food doesn't taste good, so you change the plate it's on.  Then you change what you're wearing.  Sorry guys, even in a 12-teamer, you're not going to enjoy your meal.

In the BCSNCG, the SEC had 2 losses.....but just 1 to itself.
8-2 SEC (really 7-1)
2-4 B12
1-3 Big East
2-2 ACC
1-2 B1G
1-2 PAC
.
Again, it's not just Bama-Bama-Bama here, with 4 different SEC schools winning NCs in this era.  That's basically unprecedented depth.  And this isn't me chanting SEC-SEC-SEC, either.  I could be a Boise State fan and still marvel at the facts.
.
A certain conference dominates the 2-team playoff, the rest of the country pouts, and moves the goalposts.  That same certain conference dominates the 4-team playoff, the rest of the country pouts, and now we have a 12-team playoff.
Guess what?  The SEC is going to have 3 or 4 or 5 teams in it, and they won't be among the worst ones in.  Regardless of seeding, if 4 SEC teams make it, they'll likely be among the top 6-7 teams in actuality. 
.
It's like your food doesn't taste good, so you change the plate it's on.  Then you change what you're wearing.  Sorry guys, even in a 12-teamer, you're not going to enjoy your meal.

Some interesting game theory. Florida is a great program, but is essentially irrelevant right now because they are in the SEC. Why stay?

How many SEC teams would have made it last year?  UGA would be a top 4 (1) pick.  Tenn and Bama were just outside the top 4.

The next SEC team ws LSU at 17, they wouldn't be in it.

How about 2021?  UGA and Bama are in it, and then Ole Miss at 8 is probably in.  So, three again.

In 2019, LSU, UGA, Florida, and ... Auburn probably not at 12.  2018 about the same, 3.

So my guess is in most years, 3.

How many SEC teams would have made it last year?  UGA would be a top 4 (1) pick.  Tenn and Bama were just outside the top 4.

The next SEC team ws LSU at 17, they wouldn't be in it.

How about 2021?  UGA and Bama are in it, and then Ole Miss at 8 is probably in.  So, three again.

In 2019, LSU, UGA, Florida, and ... Auburn probably not at 12.  2018 about the same, 3.

So my guess is in most years, 3.

You could also look at it the other way.....in years Clemson (or whoever) dominates the ACC, ND isn't great, and the PAC has a 2-3 loss champ.......the math starts getting interesting.

Mkay.

Reasons they are expanding the playoffs, ranked.

1. $$$$$$$$$$$$$
2. $$$$$$$$$$$
3. $$$$$$$$$$
4. $$$$$$$$
5. $$$$$$
6. $$$$
7. $$$
8. $$
9. $
10. Something about conference fanservice.