There is a market for DA/SA hammer-fired guns. Admittedly, it is a minority of pistol owners. But still... DA/SA pistols can offer very good triggers and the functional security inherent in a long-trigger pull for the first DA press. A lot of folks who have hammer-fired range or service pistols (e.g., Hk, Beretta 92, Classic Sigs, the 1911's, etc.) want a hammer-fired CCW pistol. Thus the XD-E, with controls a bit like a 1911.
On the other hand, DA/SA guns are consistently slower to get off the first round than almost any striker-fired gun in a timed shooting event. And the hammer is a sort of design handicap in terms of physics -- it tends to need to over-hang the back of the grip to have enough room to be cocked (best example is the XD-E, but the new CSX has a bit of that too).
I've got an XD-E. It has a great trigger. It has a very easy to rack slide, even if the hammer is down. It is well-built -- HS Product makes good guns -- and it is reliable and accurate. On the other hand, it has a low magazine capacity (particularly when compared to the latest generation of micro-9's, which typically have 12 or so rounds). And it very, very ugly: it has that Hi-Point look to it. And many of them came with the words "Grip Zone" embossed on the sides of the grips. Ugh.
I don't think the world will miss the XD-E. But if Springfield (a company that sells guns made elsewhere) thought about it, they could have someone design a hammer-fired pistol with larger magazine capacity and make it a little more compact and better looking. Looks matter; a pistol is a piece of industrial art; many of us respond to a well-designed and finished pistol like we do when we see a great car, motorcycle, airplane, boat, etc. A great looking pistol in the desired size, for example, is the Colt 1903 .32 ACP. They are seductive - you just know they are going to shoot well (and they do). That's what Springfield should be looking to accomplish in its replacement for the XD-E.