What viability? It's 2011. E6 film sales tanked 5-7 years ago along with quality processing in many markets. Pro E6 shooters kept it all afloat until they switched to digital. Amateurs could never sustain that kind of volume. But then none of this is really news, is it?
I meant viability not in terms of high volume/profit for the makers of slide film. Instead I meant that slide film as a medium is only useful if you can get a range of different films with a choice of contrast and saturation levels. I wouldn't bother with slide film if E100VS (my absolute personal favorite) was the only choice, as certainly not every subject warrants its level of contrast and saturation.
Trying to be the best of whatever I am, even if what I am is no good.