Not really. First of all, there always has been more non-magic users than the magic users. Not to mention the magic users hadn't always been the most powerful beings on the planet. Had Merlin tried to do what you had suggested, King Arthur would have blasted him with Excalibur.SeruraRenge wrote:if that's the case, why didn't they just wipe out the non-magic users centuries ago before modern warfare could make that difficult? If only magi were left, they wouldn't have to worry about how openly they used and studied magic.
It doesn't seem too unreasonable when you think about it. Faustus sold his own soul for knowledge. Why wouldn't the Magus Association sacrifice the "normal" people of the world in order to turn it into a mage-focused planet? Surely their goals would be accomplished faster this way. From a purely logical standpoint, it would only make sense to do whatever it takes to have your goal be accomplished more quickly.
Also, the magic users in the past could not have known how the magic would deteriote by the introduction of technology. I mean, the power of magic has diminished, but the knowledge about it has actually increased. Probably by the time they figured out why the magic has become weaker, it probably was too late to resolve the situation so violently. Beside, hindsight is always perfect.
On top of that, mythicism cannot really be conceived without its secrecy. If everyone who doesn't know magic is eliminated, then only those who know magic will remain, making magic no longer a well-hidden secret. Thus gone is its mythicism, and so is its power.
Simply, nothing in life is so simple to solve.