so is Florida one of the best of all time? they've won a few championships (all since 1996) but didn't even win their first SEC title until 1991. Seems like there should be a little more consistency when you're talking about the "all time" greats.
Princeton's 1st NC: 1869. They had continued success with winning NCs every decade until the 1936-1949 drought, but one another in 1950. Granted many of these are split NCs, but an NC is an NC. Also, yes, obviously several were seasons when they were 1-0...but that's still better than 0-1. They have 804 wins in 1253 games for a .662 win %. Yale has an even better record with 884 wins in 1301 games for a .701 win %. Yale also had its first NC in 1872 and similarly won NCs repeatedly until 1909, then had a drought until 1927.
Despite their NC droughts, both team have continued winning games and have over 800 total victories. While the talent pool may have been less in the early days, the ability to have an 8+ win with 0 loss seasons should never be undervalued.
As for Florida, they are not in consideration. They have had longevity with 691 wins in 1131 games for a .629 win % and are currently #20 on the All Time win % ranking list. Any team in the top 20 in win % should be in considered an impressive program, but there is a big difference between being on a list of All Time great programs and All Time Best/Greatest though. UM and ND are at the top of that list based on their Wins and Win %, it is arguable for either to claim that title. Back when UM held both it was a little easier, but the RR&Hoke era obviously hurt that. Hopefully within 10 years, UM holds both again.
Now Boise State is interesting because they are actually currently #3 on the All Time Win % list. However, they only have 565 games for their .724 Win %. To me, it is a little unfair to compare them against teams with twice as many games, so I think the threshold should be a program playing 1000 games is a reasonable threshold. Once they reach that, if they are still over .700 then there is room for arguing in favor of them being an All Time Great program.
Maybe .650+ should be the requirement for All-Time Impressive and .700 for All-Time Great. If you wish to apply that, then Princeton would drop down to Impressive but Yale would still be a Great program. Unfortunately MSU is currently at just over .600; however, their current level of performance is building up the potential for them to attain the Impressive status, but the Great level might not be achievable for a very long time.
Not knocking what MSU has done in the last decade, but we are talking about sustained high levels of play with understanding there will be drop offs over time...but the maintaining of All Time greatness does not allow for truncated years because it, by definition, is ALL TIME.
Much depends on how you choose to break it down, but any program with over 1000 games played and a .700 win % should be in consideration. This may need to be bumped up to 1500 games in the future so that it takes into account over 100 years of football existence (more games per year now than in past). If a school maintains .700+ over 100 years, they are pretty worthy of being in consideration IMO...so maybe Boise needs to cross that threshold before being in consideration. I personally think that is a legit requirement, but others may feel 50 years is sufficient. Still a .724 win % to be #3 on the list is very impressive for a smaller school.
In case you are wondering, the 1000 games threshold will be met by 90 teams by the end of this year, with Rutgers being #1 at 1301 followed by Navy and Michigan. So the 1500 games threshold is many years away from being reasonable, but the 1000 games is currently appropriate.