I'd suggest that this is perhaps the most significant 'loss' for some time. For me it was a replacement for Fuji Sensia 100 and I've liked using it for the past year or so. The alternative Kodak E100 films are considerably more expensive (twice the price from where I normally buy) and if Kodak can't make a go of something cheap and cheerful, then I don't see the more expensive alternatives being long for this world, especially in 35mm. I'd guess that the 35mm slide medium is probably almost exclusively amateur territory. Chris Crawford (above) mentions his use of the pro material, but is that in 35mm or MF, Chris? (P.S. - Hope I'm wrong!)
best wishes,
Steve