I'm not sure what motivated Microsoft to buy Bethesda/ZeniMax (and likewise for Bethesda/ZeniMax to sell to MS), but I'm sure for smaller developers like Obsidian and InXile, being bought out by a larger corp means there's a certain comfort of not having to deal with the threat of collapse due to barely staying afloat in such a cutthroat business. I was under the impression Bethesda/ZeniMax were doing well with owning popular development houses that create such lucrative IPs, but maybe I was wrong. I do appreciate this kind of chatter though. You try going to reddit for any of the threads about this news and there's almost no talk about the consequences of fewer and fewer individual companies, it's mostly about the potential for games.
Having said that, /r/linux_gaming has gone nuts and think this is a $7.5 billion attempt to squash Vulkan despite Microsoft being on the Khronos contributor members list. But of course, the lack of attention for games on Linux is never due to the incredibly small desktop user base, it's always some conspiracy. I don't like being a Linux user sometimes.