Sega has been in the business for 46 years. Look at them now...Irridium said:Nintendo has been in business in the games industry for well over, what, 25 years? I think they'll be fine.
Yes Nintendo is doing well now, this is the first time they've seen leading success in 3 console generations, long term saying Nintendo is doomed is a stretch, but they will not be as successful as they are now with home consoles at least. Handheld wise the iPhone/iPod touch is Nintendo's major competitor and are quickly catching up in sales. I personally think Nintendo's third party support (or lack there of) will hurt them long run.