forethought14 on 12 August 2013
Nintendo started to lose support and that eventually led to its reduction in sales for each consecutive console generation. Plus, more competition came out and took in many people. The N64 had its hardware issues, so did the GCN. Now Nintendo has seemingly fixed any form of hardware issues that 3rd parties disliked (cartridges, mini-dvd, etc) and the problem now is the horsepower, though honestly it's not as big of a problem as the issues that plagued the N64 and GCN. At least, that's the only reason why I see the decline of hardware sales with each passing generation and why people have deemed Nintendo as "doomed status".
