As a former Ivy League football player, I can say with 100% confidence that they will never ever ever get rid of football. While football might not be a "primary" concern on most of the campuses, the football teams tend to produce some of the most generous and loyal donors.
Recently, the majority of teams have made large commitments to football. Dartmouth recently completed a total renovation of their stadium and football facilities. Brown is renovating facilities, Harvard continues to invest in their stadium and athletic facilities, etc... Princeton's football stadium was torn down and rebuilt not long ago either.
Football is core to the idea of the Ivy League, and it's one of the reasons that this athletic conference (which is what it is) exists at all. In the same way Notre Dame views its football independence as core to their identity, football and Ivy League schools go hand-in-hand.
Adcorbett's comments about the Ivy League not being as "dangerous" as other levels is an unsupported and nonsensical statement. Ivy league players get the same concussions as everyone else, they've just been more proactive in seeking ways to limit the negative effects. Remember that the Big Ten partnered with this same "safe" league for concussion research:
http://blogs.edweek.org/edweek/schooled_...rship.html
All the talk about some schools dropping football and some members going anywhere is nonsense. Ivy League schools value the brand of being in the Ivy League conference more than anything else. Football is a rounding error for their budgets and they'll support Varsity football so long as their endowments exist.
Feel free to continue speculating on this, but pigs, unicorns, and leprechauns will all fly over Franklin Field together before any of these teams drop football or switch conferences.