Nobody should be required to buy days they don't want at the existing parks to get access to Epic.
I understand why Universal would feel this is a prudent strategy from a cold, clinical perspective (they're worried about the two parks getting cannibalized in the initial Epic excitement... which I think is something they should be worried about), but that practice should not be rewarded if a person can at all help it.
The uncertainty of what additional options may be available, and when, is frustrating, but I think folks (i.e. those of us who haven't been able to purchase anything yet) should continue to hold out for additional options and hope that those options will materialize in a reasonable timeframe.