someone (me, lol) threw out the idea that the day you stop getting xp (and for the following 40 days, i guess) you could boost twice to get up to level 72.
only downside i see to that is a new trend in skipping your first couple of boosts, and just making them up on the other end, which would be like a very minor version of super slow building.
you'd maybe have to throw in some extra clauses so that it wasn't advantageous to use the final boosts instead of getting to 72 the old fashioned way.