The bad news is Hai to Gensou no Grimgar is licensed, so the fan translation that was halfway through volume 4 randomly stopping was no doubt due to this. The good news is that someday the official translation should reach volume 4 and then we can at least pay to read the series.
There are so many licensed series that never reach past where the fan translation already reaches, though, that I'm not going to hold my breath. The pace of official book releases is always extraordinarily slow, too. If we ever do get to read volume 4 in English, it'll be in 2020 or something ridiculous.
Hai to Gensou, like PapaKiki, is right up there in quality with SAO. So even if I have to pay to read this series I'll do so. I can't afford to miss this epic adventure. I only wish I could pay to read PapaKiki in English. Unfortunately it was never licensed or fan translated.
I'm pretty ambivalent about official English translations though. If they actually went through with their promises and translated the entire series, they would be good things, because most fan translations never make it that far. But since they usually don't do that, they just make you pay for the same junk product that was originally free. I feel like if you're going to stop fan translators from translating a series, at the very least you should promise to translate the entire series. Otherwise you're just a dog in the manger. Also, official translations should go much faster than fan translations. A fan is just doing it as a hobby in his or her spare time. A pro is supposed to be doing it as a job, working most hours out of every day. How is it possible that official translations can come out so slowly then? They should translate all the way to the most recent released volume in Japan, not always lag five years behind.
Official translations that kept up with the current Japanese releases would at least have some value compared to fan translation sites which are always ponderously far behind. But most of the time these official products somehow manage to proceed even more slowly than the fan translation projects they preempt. Just give me some reason why your product is worth paying for, please. . .
P.S. Speaking of books that are fan translated, I finished Baccano volume 9 and am now working on volume 10.
P.P.S. Speaking of books that will soon be officially translated, Akame ga Kill! Zero volume 5 comes out in just two days now.