So let's get all the cons out of the way:
1- Developer fragmentation and optimization headaches.
RX:
A) Better tools to identify targets, deficiencies, instability.
B) Devkits designed to offer both platforms (PS4/4K) ideal performance values for their respective hardware.
2- Consumer confidence waning.
RX:
A) Set logical scheduled releases that aren't too close (<2 years) or too long (>5 years).
B) Insure consumers that as long as a game supports a "Genus" the "4" in the PS4; that it will be playable on the "Family" of PlayStation devices PS4, PS4K, PS4KS etc.
3- Poor legacy platform support.
RX:
A) Mandate strict policies which have specific targets for all platforms. IE PS4 title should run at minimum 720p 30 FPS at >90% of gameplay. etc.
B) GAURAUNTEE THAT IN NO WAY SHAPE OR FORM SONY WILL EVER FRAGMENT THE USERBASE.