Clearly there is interest and a market for aero diesels. One look at all the OEMs starting to offer these options shows there is a future for these powerplants.
The past should be a strong lesson to their developers as I said before, not all diesel designs have been ready for prime time when introduced even after certification.
Cessna has offered or planned to offer diesel powerplants in their products several times now but had to back pedal when things went wrong. It happened again this month:
http://www.aopa.org/News-and-Video/All-News/2015/May/14/Cessna-not-accepting-182-JT-A-orders.
This is not an easy task. Altitude performance and relight can be issues along with the higher weight and cost.
The manufacturers will evolve the engines and tackle the performance and reliability issues I believe. When they do, we'll see a lot more flying, especially in places where avgas is expensive or hard to find.
I was thinking of this new design's use of supercharger and turbo, this might be to improve altitude relight performance actually.