This is not in any way specific to Hyundai or anything in the context of cars, but there is plenty of proof that multi-billion dollar companies can make stupid decisions/mistakes. Look at the Ford Explorer roll over scandal, GM ignition scandal, the Takata airbag recall, or the recent VW emissions cheating issue. I can probably come up with a dozen more examples in 5 minutes.
Plenty of proof that multi-billion dollar companies can make really bad decisions.
And Acura and Infinity are proof that large companies can be seriously wrong about how to create a luxury brand - I would consider both of these companies to be poor attempts at trying to complete with the four German luxury marques (BMW, Audi, MB and Porsche) - the only company that has succeeded at this so far was Lexus, to an extend (you won't see many in Europe, they haven't arrived there). Jaguar, Land Rover and
Cadillac are recovering, Volvo and
Lincoln may be contenders, and Tesla is successful by trying something different.
Hyundai can go talk to people at Honda and Nissan about what it takes to build a luxury brand from nothing - so far only Toyota has had some success in establishing a new luxury brand in the past 30 years - and I would argue Tesla is successful, although with a very different approach.
There are plenty of things that can go wrong for Genesis, based on data from the last 30 years I think their chance of failure is bigger than that of success.