Good comments from everyone.
This thread has kind of split into a discussion of work flow and a discussion about the sustainability of that a scanner based work flow. If I could do a color analog workflow, I would but that is beyond the level of effort I am willing to make and as sanking says, it is hard to beat the film to scan to PS to inkjet print color workflow.
The sustainability issue is what is vexing. I have an Epson 4990 but prefer the 9000 for slides, 35mm and 120. There are certainly better scanners in existence; however, these are mostly drum scanners. The only drum scanners being sold by B&H right now are Hasselblad Flextight scanners starting at 13K. I agree that there appears to be considerable demand for scanners like the 9000 but that has not prompted Nikon to increase the production of these scanners. So I am guessing that Nikon and anyone else who is making a pure film scanner, including all the drum scanner manufactures will get out of the market in a reasonably short period of time. Maybe five years. This leaves the flat bed scanners , mostly the Epsons. Maybe they are comparable to a Nikon 9000, for me it is a step down, albeit, a small one. How long will Epson provide good film scanning capability in a flatbed scanner is an interesting question. The driver for most folks who buy a scanner it so be able to scan paper. You would think that with billons of negatives hiding in drawers and shoe boxes all over the world that there would be a huge demand for film capable scanners. This does not seem to be the case.
As one looks at the technology used to support scanners, computers and software, one does not have to look very far to see the demise of the workstation. iPods and netstations will start to dominate the non-commercial users and PC’s and laptops will be less common. Whether these will be able to support scanners is doubtful. In fact with the throw away mentality inherent in digital, I will also guess that the interest in scanners in general will diminish. Since my time frame is 20 years, I was curious how technology has changed over the last 20 years. In 1990 what was current was the 386 chip, Windows 3.0 and XGA. A lot of changes in 20 years; however, the technology present then would still be recognizable to most today. Based on the apparent rate of change of technology I will make my final guess that things will not move as quickly as I feared.
Have said all this, I am still no sure if I should invest in spare scanner now or trust that the Epson will continue to provide good film Flatbed scanners.
In the meantime I will go back to scanning my father’s slides from the 1960’s. Kodachrome makes such beautiful scans.