For me, this is not a matter of me being able to complete the event or not. This is another step in the continued inflation in points required for fusion events.
Requiring 7k energy to finsih a DD is an extreme burden on an early-game account or a mid-game account, and frag collectors have historically been the easiest fusions to complete, meaning that those accounts are the target audience. If frag collectors get pushed beyond the ability of the mid-game accounts to reasonably complete, it just makes the game that much LESS FUN (and more difficult) for new players.
Will I be able to finish the DD? Certainly. I don't need the toon, but she looks interesting enough to not skip. However, I do see this as a dramatic increase in required resources for a frag collector, and I think that is a terrible precedent.