I don't get how lower oil prices affects Nintendo.
And Sony is probably on hold cause their other divisions like the mobile one are doing pretty badly. Nothing to do with Playstation.

People seems to forget that Sony is not just PS4

Ok, the PS4 is doing great, but Vita is a dissapointment and other Sony divisions - cameras, phones, tvs - are not doing good... didn´t they close their notebook division not long ago? Didn´t they had a big layoff recently? And how many consecutive years have they been getting losses? 3? 4?
That´s why their stock is in "hold". People still want to see what Sony will do to revert this situation

Nintendo seems to have broken the cycle of losses in recent years, so investitors may feel "a little" confident about them now.

You should've included the rest of the article, 'cause that's where the important stuff is.

Cheaper shipping costs and more disposable income for consumers.  The magnitude of that for Nintendo is hard to say though.

I'm talking about the big picture, not just nintendo. But everything is connected

Cheap oil is still good, except for heavy industry, resource-based economies, and the financial sector, but this is offset by increased retail strength and disposable income.

...And how is cheap oil hurting in the big picture? If you're talking about evinronmental issues, cheap oil usually indicates low demand.

I'm talking about the real big picture big companies and countries calculated their financial year and next year(s) with the price of oil around 90-100$.

Downsizing and becoming an independent publisher would see an initial drop in stock prices as people jump ship just like we saw with Sega. This would be terrible if you purchased stock now.

However, after most of those ship jumpers have gone and the price has settled down, it would be an excellent time to buy stock since we know that to be a profitable move eventually. Depending on whether or not they (Nintendo) downsized with enough resources to make the transformation without bankruptcy. But they'd never go through bankruptcy as that would require selling off assets which includes IPs like Mario and such.

Ok. Done.