In truth an DB-esque power level has been baked into the cake long before the midichlorians were invented going all the way back to the OT and Luke being strong in the force not due any particular training or spiritual understanding on the nature of the Force but merely because he was born with it due to being Anakin's child. With only Luke, or potentially Leia, being capable of stopping Vader and the Emperor out of an entire galaxy beings.
I disagree, that is just standard fantasy tropes/cliches/whatever. It is the same sort of idea as Aragorn being awesome, because he is the rightful king and his magic blood runs the truest. It is just normal fantasy conceits in a science fantasy setting.