When I heard Poppy, Wind, Kaguya and Marnie were all flopping, I was starting to wonder if this would happen.
The good news is that the company isn't being simply wrapped up, it's just going to a state of hypersleep I guess? The rest of the world has yet to get Kuguya and Marnie, so Ghibli will have some cashflow from the cinema and home video releases of those (not to mention all the other Ghibli films)
But yeah, Ghibi also has the problem that...2D animation is a quickly shrinking field in general. While I'm sure they have some young blood (Ocean Waves was done entirely by their at-the-time rookie team as I recall?) - there's less and less people who study traditional animation or are even up to the level Ghibli would be looking for.
I really liked Poppy Hill (and it felt like a triumph for Goro Miyazaki after the whole mess with Earthsea) and while Wind wasn't quite up my alley, it is an emotional tour de force. If Marnie is the endgame. I think...that's kind of okay? It's sad, but at the same time, Ghibli lived up to it's full potential in a number of ways. If they haven't the talent or confidence in whatever was proposed prior to this, better to pass up till a new passionate lot comes in.
There will be other people who will use the medium to do amazing things, this isn't the end