There's a lot more to what Sony is doing. The $5 billion you're likely referring to was just the remaining budget from their $18 billion 3-year plan. Which was set to end this coming March. Things have changed. Sony is now looking into spinning off their financial arm over the next couple years. It's speculated that could give them between 8 to 10 billion dollars more.
This slims their market diversity down. Their intention is to focus more on entertainment and image sensor investments. Also, not operating a bank means they don't have to worry about banking regulations. They currently have billions, possibly tens of billions, tied up in banking reserves that they're required to have. Future cash flow won't be tied up in that.
This is on top of the current $14.4 billion in cash they have. Which could continue to go up, as it has since last September. Of course, this doesn't get into stock swaps to reduce paying in full cash or simply getting loans to help finance a large investment.
Removing their banking division really cannot be overstated for how much that would change things. That will leave SIE as the largest revenue generator for the company by a large margin. With video games as the largest growth vector for the company and fueling their entertainment arm overall. Sony has stated they're very aware of the industry consolidation and they won't sit idle. Expect them to make big moves within the next few years. Regardless of how the ABK deal shakes out.
In Cold Blood
Did I say something wrong here? Or do you just not like the idea that Sony probably isn't sitting still?