I've got a useless degree in Japanese sociology, never underestimate how stupid Japanese corporations can be. Fujifilm themselves have stated in the past that they want to entice film holdouts into the X system. Imported film stocks have protectionist/racketeer prices so Fujifilm can do whatever the hell they want and still come out cheaper. For example, a propack of Porta 800 in 120 goes for ¥8,000-10,000. The 400 is around ¥6,000 but you can get Fuji 400H all day long for ¥4,000.
And yeah, some labs won't touch anything except basic Fujifilm. And most of the people still shooting film are fossils who would rather buy Japanese anyway.
A few weeks ago I found a camera shop that was frozen in time. They had beat-up old gear from the 70s and 80s, priced delusionally. I'm talking like an F4 with the worst Cosina-made kitlens Nikon ever shat out for over ¥50,000 and there wasn't a single digital camera or piece of modern equipment in there. Yet it was full of ancient seniors just buying film and bullshitting about the old days. Those are the people keeping film alive over here, not young, spry, not-gonna-die hipsters like other places. That generation isn't going to be around much longer and the international film market is much less profitable.