Let me take a look at the ol' timetables:
October 2002 from FLL to:
ATL 6x764, 3x 763, 1x762 1x752, 1xMD88 = 3022 seats daily
BOS 4x732 = 476
CVG 1x752, 2xMD88,1xCRJ = 516
DFW 1x763, 2x MD90 = 556
BDL 3x732 = 357
ISP 1x732 = 119
EWR 2x 732 = 238
LGA 1x763,1x752,1xMD88 = 580
JFK 6x732 = 714
MCO 4xCRJ = 200
TLH 2xCRJ = 100
TPA 1x752 = 182 (this flight continued on to LAX)
Total daily seats for FLL = 7060
October 2003 from FLL to:
ATL 6x764, 4x763 = 2746
BOS 3x752 = 597
CVG 2xMD88,1xCRJ = 334
CMH 1xERJ,1xER3 = 87
DFW 2x738 = 296
BDL 2x752 = 398
LAS 1x752 = 199
LAX 1x752 = 199
BNA 1xER3 = 37
EWR 2x752 = 398
LGA 4x752 = 796
JFK 5x752 = 995
MCO 3xER3,1xCRJ = 161
RDU 2xER3 = 74
TLH 1xER3, 1xCRJ = 87
DCA 1xCRJ =50
Total daily seats for FLL = 7454
I'm too lazy to multiply all the distances by the number of seats to calculate the actual ASM's, but just by eyeballing I would say that ASM's were higher in Oct 03 than Oct 02.
To be fair however, during the first six months at FLL there was no Song service. Plus some of the RJ routes (BNA,RDU) weren't launched until later in the year. So it is very likely that DL's ASMs at FLL in the first half of 03 were lower than 02 which could explain much of the drop.
Looking at these numbers, it is clear that DL has reduced capacity from FLL to the hubs while increasing capacity on the point-to-point Song and Delta Connection routes. The upside to this strategy is that you can more cost efficiently compete with the LCC's by taking passengers directly to where they want to go.
The downside to this strategy is that you can weaken your hubs by reducing connecting opportunities and drawing traffic away. For example, DL cut capacity on the DFW-FLL route, reducing it to only 2x daily flights. Folks in FLL don't really care about the loss to DFW as DL gave them nonstop flights to LAS and LAX...two high demand routes. However, folks in LBB that connect in DFW going to FLL are impacted. LBB has four flights to DFW but now only two of those connect to FLL. By chopping that third flight to FLL, DL has weakened themselves in a market like LBB.
Trying to be both a point-to-point carrier and a hub and spoke carrier is going to be very tough for DL. ATL won't likely be hurt by the point to point flying as it is too much of a mega-hub and has strong O+D traffic. However, CVG, DFW and SLC could be seriously injured if Song expands too much.