IMHO, Whether it's 27 or 127 the way fuel prices are the diesel center console is just coming into it's own. At the Boston show people were climbing all over it. They tuck that power plant under the helm/helm seat. Albin / Cape Cod have a great product.
I believe Ric is right that the majority still think outboard. The 26CC, though not very Albin as we know it, could have filled a very tidy little niche if the boat market hadn't tanked.
Before my Albin I remember the 12.5 gph fuel burn I used to average with my CC & twin 200's. A guy a couple of berths down form me put in his new Shamrock with Yanmar power

this was just before Albin mainlined theirs . Since, for me, came the 28TE. A couple more Shamrock's have since appeared with diesel power and a couple of older oddball CC's with diesel power (all fisherman). Their is a market, though how large ????