There is something we are over-looking. If and when Ilford/Harman introduce a newer colour film, it will be difficult to sell the remaining Phoenix film stocks.
Last Friday I was talking to someone in the trade, they offer C41, E6, ECN2, as well as B&W processing. They are reluctant to process Phoenix film, they correctly pointed out the best results come from people home processing and scanning or printing their own negatives. A lot is down to the longer time interpreting scans in a commercial environment, and that's best left to the photographer. I'd add the company also sells a lot of C41 & chemistry, so their comments on Phoenix are based on customers comments (and images).
There was a similar issue when Ilford launched XP1, it could be processed in C41 chemistry or Ilford's own XP1 chemistry. The issue was it needed a non-standard C41 development time, so labs couldn't process it alongside C41 films, in addition Ilford gave times in their chemistry for N- & N+ development, and push processing times. The result was most labs were reluctant to process XP1.
So XP1 was replaced by XP2 which used the standard C41 development time, there was no mention of push processing, or N-/N+ development times in the datasheets. At the time I was using XP1 then XP2 push processed to 1600 or 3200 EI to shoot rock concerts and discussed this on a trip to Ilford in Mobberley. I was told labs had asked for the compatibility, but of course like XP1 it could be push processed, labs had asked for that to be left out as well.
Red Scale film 35mm & 120 is a way to help shift what's left of the Phoenix film. Phoenix itself was also about converting Ilford's existing B&W coating line as well as the surrounding infra structure to coat colour materials. When I visited Mobberley in the early to mid 1980s they had just consolidated to the site, closing their Ilford factories, selling off their Graphics and Medical side to Agfa. A space on the site was designated for a new building to house a colour coating facility, they still had staff and researchers who had been involved with the company's earlier colour films in the 50s & 60s. They began selling 35mm E6 films (and I think C41) in the early 1980s hoping to build up a share of the colour market, re-branding Konica/Sakura films. However, these films were not in the same league as Agfa, Fuji, Kodak and even 3M/Ferrania, and didn't sell well. I did try the Ilfochrome E6 film and was not impressed.
Ian