1. MF never covered the cost of DME, so there would be no reduction for us. My understanding is that the line item for “transportation“ in our MF correlates to resort-to-park transport, for example, Skyliner. I could have misunderstood though, I’m sure one of the more seasoned owners will chime in.
Disney has always been very dodgy about transportation costs. They claim they use internal calculations based upon types of transportation offered, resort size, frequency and distance to each destination to set costs. But the general rule of thumb is that if Disney can pass some costs on to DVC owners, they will. There's little reason to believe Disney is absorbing 100% of the cost of DME itself.