Yeah, I'm sure Sega have been struggling for a while. With Aliens they put a lot of eggs in what should have been a really lucrative license for them, and my understanding at that point was that they would become the big focus for them going forward. Neither of their released Alien games sold very well (and Colonial Marines even ended in them paying out compensation to players in a class action lawsuit) and the subsequent ones that were planned/rumoured got cancelled or dropped off the radar. All rumblings are that all isn't great for Sega, and hasn't been for a long time sadly. Gutted, because Alien: Isolation was great and showed how an Alien game could work.
Nintendo's biggest problem seems to be attach rate, platform holders make a lot of their money (and most of their money if they're selling their consoles at a loss, which many do at launch) from their cut of game sales and certification on their platforms, and even when Nintendo do manage to release a console that sells like crazy, that never seems to translate into game sales for them the way it does for the other platform holders and that has to have a big impact on how profitable their console business is.
This is the first Nintendo console in a long time that's really got my interest though, because the sheer convenience of being able to take home console quality games on the move like that is massively enticing. Mario aside I've never been that into their first party stuff though, so for me it'll depend on how good the third party support is and if it can compete with my xbox for my attention.