What about Honda? It's pretty huge company, surely bigger than Mitsubishi and I thought it's doing ok. Also Nissan is big.
And Nintendo isn't bigger than Sony, maybe more valuable at a time but in terms of revenue, number of factories, employees Sony is much bigger. For example Sony's revenue is 70 billions $ per year (which is about one third of what Toyota makes), Nintendo is only 7.8 billion. But being huge company and generating profit (thus being valuable) aren't the same things. Actually some big company in a part of its life can be worth close to nothing.
And the chance of Nintendo beating Toyota (assuming Toyota keeps its level its success) is pretty low. Acutally the fact that Nintendo is worth one third of a company which has 30 times bigger profits is an outstanding result.







