If we move to that model, IOG will no longer work on Cardano. It is impossible to run a sustainable business with a task based system under the supervision of a decentralized ecosystem of non-SMEs.
90 percent of our time will be fighting with non-developers about why something costs X and not Y. There will be constant funding delays. I won't be able to make payroll for the devs or scientists because we will have no consistency or assurance of getting the next "task". You'll find that every other credible company of scale has the same opinion.
You will effectively kill any professional development of cardano and rely upon the gig economy for stuff that requires years of domain expertise.