DLRP is already the #1 destination in Europe.
Can you believe that there is about the same number of guests visiting DLP and MK each year ? (roughly 16 millions each)
I had to check this and I apologise if this seems like checking up on you, I was genuinely interested. This is only wikipedia so pinch of salt although the sources look ok,
2011 attendance
Rank 1 Magic Kingdom at Walt Disney World Resort 17,142,000
Rank 20 Disneyland Park at Disneyland Paris 10,990,000
Which is a pretty big difference.
In size terms
MK is 107 acres
DP is 140 acres
I can't find anything reliable on staffing levels but it appears there are significantly more in Orlando than Paris as a ratio of staff per visiting guest.
The tickets are pretty cheap for DLRP really, if the experience were there and the service and food were there it could be making money on a much larger scale. This is all armchair management of course.