I've done this as a new dev. In the end a few new devs aren't going to change things against stubborn old talent and a large swat of new devs passively standing by, until the proof is there. But that's the exact problem: these systems are so large, you need people to be willing to risk extrapolating a PoC or be willing to invest until the proof is there right in front of their eyes. With how risk-averse most companies are, the odds of this happening are miniscule. Unless you wish to invest your own time, effort and risk (which I don't think should be the answer, despite how often it is given).
I've done this as a new dev. In the end a few new devs aren't going to change things against stubborn old talent and a large swat of new devs passively standing by, until the proof is there. But that's the exact problem: these systems are so large, you need people to be willing to risk extrapolating a PoC or be willing to invest until the proof is there right in front of their eyes. With how risk-averse most companies are, the odds of this happening are miniscule. Unless you wish to invest your own time, effort and risk (which I don't think should be the answer, despite how often it is given).