E6 is not in a healthy state at this time. If it is to survive into the medium-term, a huge lot of E6 film across all manufacturers that we currently have must be consumed. The fact that throughput is so small through commercial processors is worrying enough because the process is filthy and wears out machines; the more films going through them, the better their operation over the longer term. Once the machines are clapped out through lack of use, they are very rarely (if at all) replaced anew. It's cheaper and most cost effective in terms of business to simply dump E6 processing. I have seen this with many labs with their machines too far gone to be salvaged.
Processing one or two rolls now and then doesn't cut it. Twenty to thirty rolls in a fortnightly period, continuing, is a good improvement, but thousands of photographers should be doing just that. They are not. It's all talk, little action. All of that E6 consumption should be done now, not at such a time in the future intedeterminate another film should make an appearance (Ektachrome, Ferrania) and somehow, the world is saved!. Ektachrome would require expansion beyond the 35mm format to MF and LF where the take-up would be more appealing. How well Ferrania fares in a global market that so many (outside the wizened confines of APUG) would be challenged to recognise the name (if at all) remains to be seen.