The downside of this approach is that Lyft doesn't have anywhere near the upside potential that Uber has. If Uber pulls off all of its ambitions it will be larger than Lyft could ever dream of being. The upside for Lyft's more humble goals is that it's chance of reaching them are much larger.
Unless Uber is willing to change its DNA and scale back its ambition, give up on its long term goals, and stay just a basic ride dispatching service then your analysis is incomplete. However perhaps this scaling back is what the CEO change is fundamentally about.