I wouldn't go with an external PSU, or really make any changes to the existing hardware beyond minor tweaks to the controller. They basically hit hit a home run this gen in that regard.
As far as the software goes, there's teething problems entering any new generation, rushing software to meet earlier deadlines would have resulted in even less complete products, a problem that is now synonymous with this gen thus far.
The Order:1886 had 3 years in development and a sizable workforce. I'm not entirely sure why, but the same problem has existed since last gen; a high proportion of early exclusives from third parties are usually half finished or have major design flaws. See Ryse, Titanfall, The Order, Lair or Heavenly Sword. Every single one of them would not really be considered a full package. Perhaps Sony should have intervened and pushed RAD to alter their focus, but they're known for having a rather hands off approach. When asked why Lair had a ridiculous control input scheme, Phil Harrison said in 2007 "Ask our friends at Factor 5".
Sunset Overdrive or Titanfall would have been additional spending that as we've seen, wasn't needed. Delaying Titanfall to the holidays though, with an additonal 8 months of development might have been a good move. It's an interesting prospect.
Keeping TLOU and GT6 for the PS4 would have meant less money for Sony overall, but a stronger push for PS4 hardware- they chose the money and in doing so also generated a large amount of good faith in gamers (the support so late into the PS3 lifecycle). I think they made the right choice with TLOU, you could make a strong case for GT6 though.
