After today news. Sony must double down on PC porting of their legacy titles and use that money for 1st party development generating a virtuous cycle.
Its time for them to take a look at their legacy IPs. Sony has to stop pretending stuff from before November 2013 does not count. Look at your japanese legacy... PS2 HD collection, PS3 franchises, PSP games, Vita... Port everything to PC and current Sony consoles. The attitude, the spirit of the PS1 and PS2, PSP and early PS3 days with Krazy Ken. That put Sony on top.
If they played their cards right at the time and did not consider PC an enemy, they could have a PC storefront only rivaled by Steam just on first party content alone. But they were clueless and arrogant being extremely late to the party. They are still the dominant console but have to play their cards right. They can be Nintendo on steroids if they want to. No need for third parties.