I'd expect that. While we're going to see an increase in dil from the STFers cashing in before the change, the there's still a lot of fleet stuff going on, and as fleets advance there's just going to be even more of a sink for dil. Plus, they're likely saving a bunch, as we're going to need it for the S7 stuff.
There's not really that much of a dil increase anyways - just a lot of folks are going to have tons of ore sitting there, waiting to be refined, as they're probably the folks that get 8000+ a day easy.
In other news, I heard that having more toons is a good way to make lots of zen (if one has the time, and I have the time), more than worth buying more char slots. For purposes of RP, I'm going to try not doing any of the story missions (at least until I can get mk x-xi stuff from them) - my main already is the big damn hero, you know. I wonder how that affects leveling speed. We'll see.