This seems to be the question, indeed. I'd say certainly not fashion forward, but of course I want to avoid looking like an old man... From the comments so far, it seems acceptable. Now, I have to get used to it
Don, I think with a single breasted SC a low gorge is less desirable because of the downward pointing lines which leaves a sad and tired impression to my eyes. You don't have that with DB of course.
FWIW, I think the lapels/gorges of the SC you posted are still acceptable, albeit perhaps not fashionably high.