It’s sure looking that way, though the Guardians aren’t in too deep a hole to climb back out. It’s hardly surprising we see those two so often–they’re huge market teams with a front office that’s willing to shell out what it takes to field a contender basically every season.
Personally I’d love to see a salary floor and a more aggressive luxury tax so that we get a more even field, but that’s probably unlikely given the inevitable pushback from both owners and players, respectively.
In my experience, very, but it’s also not magic. Being able to package an application with its environment and ship it to any machine that can run Docker is great but it doesn’t solve the fact that modern deployment architecture can become extremely complicated, and Docker adds another component that needs configuration and debugging to an already complicated stack.