It's difficult to see how players will be able to reconcile their individual goals with those of their alliance. Individual rank being measured by score and alliance rank by value means that one of them must be sacrificed (except, as has already been mentioned, for Ziks).
So far I've always been able to set my own (modest) personal targets. I always aim to end in the top 10% of planets and still make a valuable contribution to keeping my alliance in the "top ten". These proposed changes mean that I'll have to choose between these targets.
Higher up the "food chain" it could get even more complicated. Will the alliances who are "genuine contenders" for the number one spot have to insist that all their players go for value. Or will they nominate a few specific players (or even just one) to go for XP to have a better chance of getting the number one planet as well?
Interesting times.