Bungie's not exactly hiring, Sony recently fired hundreds of Bungie employees and moved hundreds of 'em to another studio.
The good news for Firewalk is that Sony promised three seasons of support for Concord, that should keep everyone occupied. Longtime support for a GAAS only makes sense if longtime players keep spending money on DLC, gear, costumes, etc. But this is only costing money, since the playerbase is so small and sales are awful. Sony will probably keep it alive because killing Concord after a months will be a PR disaster, but it would be the sensible thing to do. No sense in throwing good money after bad and there's no point in keeping Firewalk to create another GAAS to be released in six year's time since they have so many other studios already working on GAAS.
And like someone said here: Sony killed multiple great studios (Evolution, Japan Studio) who created great games because according to Sony they were underperforming with regards to sales and metacritic reviews. Well, the Concord sales/review disaster is many, many times worse.