For me both the VX40 or another AC5 type design would be boring. The AC should be at the cutting edge, there's not many events in sailing that are (design wise). That Mitch Booth interview kinda implied he favoured a catamaran box rule. I personally would like to see a box rule that allowed cats, tris, foilers, whatever, but with a greater range of allowable sea and wind states. If costs were an issue, just introduce a few restrictions, almost like a giant NZMYC Open 8.5 Rule.

Using an existing class for the AC would reduce it as a spectacle.

Still, we all know it's going to raced in monohulls though don't we? Lets not kid ourselves.