Whenever DT try to "use elements" from other bands and genres, they usually just end up sounding like them. This applies mostly to the pre-Mangini stuff, considering that BMUBMD and Outcry is well executed, while for example Prophets of War is a tad too much of a nod.
I wouldn't want DT to try to make a "full electronic" song, simply because that's not the kind of music they do. The way Jordan uses synth sounds in Outcry and BMUBMD to create an electronic feel is well executed and exists because it fits in there. Dream Theater should stay progressive, but the degree to which electronic music has been experimented with so far is enough, in my opinion. They're a rock/metal band, after all.