Most people saying "Time to switch from MySQL" (probably) aren't paying for MySQL. From a business perspective, those people are a net loss anyway. Getting them to switch to something else may actually save Oracle a little money.
But they could happen in the future to work for a corporation that would like to pay, but as it stands they will never suggest using MySQL. Thus MySQL will slowly disappear from the youngs mindshare and Oracle will make no money at all on it.
Most people saying "Time to switch from MySQL" (probably) aren't paying for MySQL. From a business perspective, those people are a net loss anyway. Getting them to switch to something else may actually save Oracle a little money.