Kodak is a publicly owned company. However they operate their business, their responsibilities lie primarily with the shareholders, and decisions are made in accordance with that. You can argue that they might not have done a very good job of making those decisions, but that's the truth. Either there is enough profit in a product, or there isn't. If there isn't, it gets chopped.
Ilford is, as far as I understand, a privately owned venture. Their responsibilities are counted differently. Yes, they still have to make profit, but they have only themselves to be held accountable to. So it's OK for them to hold onto a low volume film, if they feel there are other reasons than profit to keep it. I don't know the numbers, but I'm sure Ilford make the bulk of their profit selling HP5+ and Delta 100, rather than SFX and Delta 3200 - but they still keep all those market lines, and my own wild guess is that they do it to have a complete market line, hopefully satisfying most of the darkroom photographers out there, instead of only those that bring the most profit. Looks good in the customers' eyes, you know.
I actually like TMX a bit more than delta and fp4+ and acros. I like TMY more than delta 400 as well.
TMX in 120 is quite amazing with such a clear base.
Tri-x will be discontinued tomorrow, but do not worry
the world ends on 21-12-2012
And I understand TMX IS good for reversal processing, partly for that reason, and I think folks use it for contast masking too (not needed so much now that Ilfochrome is gone - but I think any black and white sheet film with a reasonable clear base could be used for that.)
i absolutely love tmx and tmy, it has been almost the only sheet film i have exposed for about 15years.
it has a beautiful grainless look and feel to it when processed in a conventional developer
and beautiful grain and fog when processed in caffenol. next to neopan, its my favorite sheet to process in java...