Sony: Free up MP, improve the Plus lineup, finish catching up with the PS3's functionality and don't throw it all away if and when PS5 comes around, make digital competitively priced with physical, maybe make the DS5 an evolved hybrid suitable for both traditional and VR gameplay (with IR sensors and better battery instead of bright lights). If you do make another handheld (unlikely), make its controls fully functional, give it proper first party support (even if it's just expanded crossbuy), and piss off with proprietary storage and crap. BC, more dedicated servers, PSN ID changes.
MS: Stop forcing an ulterior agenda down our throats, be it Kinect, TV, always online, Windows 10, DX12, whathaveyou. Grow and diversify your first party lineup and try not to sabotage or bastardize once great studios. Assuming you're not going to scrap it like GFWL, keep your word and massively reform UWP from its draconian origins. Just stop trying to pull all this sneaky crap. Free up MP, too.
Nin: Don't let gimmicks and old blood override competitive features and sound decision making. I'd be fine if you just doubled down on your handheld and mostly got out of the home console space where you tend to struggle commercially. If not, it really needs to be powerful enough to accommodate third parties. You like creative hardware, but don't let it get in the way of fundamental control and game design. Bring back long requested IP's in respectful ways and keep making new ones. Catch up with MP infrastructure and throw in some achievements, too. Don't pander to the casuals too much. Maybe inject more personality into your mascots and storytelling into your games.
Valve: Properly release Source 2, make some games again, and scrap Greenlight.
Steam/Origin-like refunds all around would be nice, too.
