Obviously the effect of throwing FP on everything will have long-term negative ramifications, but it is clear from watching CA and Paris over the past few years (and to a lesser extent, HK and Shanghai) that someone higher up is clearly pushing FP FP FP at all costs, upcharge or otherwise. It appears to extend far beyond just some clueless DLR managers.
If that is the case, that FP must be added at all costs, MI and Autopia are logical candidates; Autopia already had it in the past, and DCA infrastructure is easier to retrofit (and realistically, what else is left to add it to? Mermaid and PhilharMagic? Unless they go full WDW and just add it to everything regardless of logic). Otherwise, they're probably out of attractions they can easily add FP to at DL without significant infrastructure changes (though Rise down the line is a no brainer).
Though now that I say that, since they're actively reworking Snow White, perhaps when that ride comes back online it'll come with FP too. Stranger things have happened. It could be a "test run" to look into the viability of reworking existing space in FL and adding FP to meet "guest demand."