User blog comment:Ygrain/Leviathan: Do you know what you are doing, Bioware?/@comment-4721065-20120906075655/@comment-4721065-20120906101427

Well, if they have enthralled everyone when they had the power to do so, I'm pretty sure that the Reapers' existence was the primary factor for their seclusion (and if that is not true, then we shouldn't even be worried about their potential incursion). The Leviathans's reproduction rate isn't stated, but it cannot be particularly high, as otherwise they wouldn't be able to hide for so long. As such, the balance of power would still be with the Reapers by a very considerable margin.

It's true that there would be certain casualties in Control, but I still don't think that the lack of conflict in synthesis will be worth the many, many issues associated with it (like what happens with the species' lifespans, whether the organics now have to be charged with electricity or synthetics now need to eat, are they both now vulnerable to viruses (biological for both, electronic for both or something else, etc, etc.).

Finally, by the "needed counter-point against Destroy", I meant that the three endings were supposed to have more-or-less the same amount of popularity behind them (this being the end of the series, etc.) A quick look at The Milman's End of the Line blog will tell you that this didn't work out: Destroy has slightly more votes than the three other endings combined. I don't think that introducing Leviathans was the best way to do it by something like that needed to be done.(Personally, I would have balanced it by changing the Destroy pulse from being insta-kill to minutes of painful, degenerative death for geth and EDI, while the Reapers use the last of their lives to self-destruct and take out a certain amount of ships and ground troops.)