My personal opinion, not a fact : what if Fujifilm prefers to sell more Sensia in 35mm to both professionals and hobby photographers, to still be able to make Astia in other formats ? That would reduce the costs for differents packagings, logistics... End of my personal opinion. I am just worried as Astia is used for single-8 movie film cartridges made by alternative companies, and worried because it's possible many films we use aren't coated anymore, and are just sold on a stock basis.
As a film is still in stock, let's use it and think of a possible replacement later. That is my way of using film now.