Yes, but the key problem outlined in the article is two part. Whether the gatekeepers (miners) can monopolize supply and demand. As you point out, one enters the "game" with known rules. However, part two is when those said rules become unfair. Simply moving over to another blockchain/coin circumvents this, BUT, as pointed out, there is inertia against this, out of human habit, laziness, but most importantly, entrenched investment (time, effort, systems).
This is the very reason why everybody hasn't quick as a flash jumped ship on the current global financial system and embraced blockchain.
It is this delay in adoption, which allows an establishment to implement actions (laws, trade sanctions, physical enforcement, war) to retain the status quo.
Example: fossil fuel vs renewables. We have lived in a petrochemical dark age for the past century.