I have to agree on that.
I think everybody has his personal preferences about upgrading certain cards, but we have to remove cards first in order to get upped cards.
Besides that, we can't upgrade too much since we have to own these cards in order to use them. I could upgrade 2 cards for the team, but currently not more than that. If that counts for everybody we need a maximum of 16 upped cards. They go by 3, so we need 18 total.
Suggestions to be removed:
-2 earthquakes (12 --> 10)
-2 discords (6 --> 4)
-2 deflags (12 --> 10)