I don't think I ever said anything about Ninja Boy but whatever.
If I was talking about "Ninja Boy" I would've said "Ninja Boy" and not " 'NINJA" AS IN GRENINJA.
Reading, it's super simple stuff.
SM is the new thing and we already have an unintended card interaction. Lunala GX has a GX move that can KO any non GX basic Pokemon. This means they can KO a EX pretty much for free. While they can't really do anything about that, since any rotation other than a hard SM rotation will still have Pokemon EX in it, for at least another year or so. Cards like Greninja BREAK ruin SM cards
Should Greninja BREAK and Espeon EX become a thing, you have broken format. Garbodor makes all these new cards useless if they have abilities. Any competent game developer won't let old content ruin anything new they are trying to do with the game. The whole reason Destiny doesn't have a Year 3 Ice Breaker is because they know how unbalanced a gun is with unlimited ammo is. Same thing applies here. If you don't think TPC/i won't do a hard rotation to make sure SM cards aren't completely smashed, then you are mistaken.
I don't know if you played back when Sabledonk was a thing but they did that very things to protect the game. If they have to go as deep as to remove Greninja BREAK from the game via deep rotation, then so be it. Greninja BREAK is a very unbalanced card considering it was designed to KO EX Pokemon and we can't have something like that around in a format that is going to be evolution based with still low HP Pokemon. Do let such a concept anger you.
As to the rest of this, almost everything here is extremely opinionated and has no foundation. GX moves can only be used once per turn and would more than likely only be used to pick up a clinching KO or to get rid of something that is being set up if the opponents board position is terrible past that.
Your point on Greninja and Espeon is an opinion and trying to state it as a forgone conclusion that it will 'break' the format is invalid. We don't know what the format is going to look like once Primal Clash through Ancient Origins is rotated out. There might be cards like this new Giratina that will be in decks to stop greninja. Garbodor makes the older cards useless as well so that's just a moot point.
I'm going to ignore your little tangent about Destiny because; 1. It has nothing to do with what's currently being discussed, and 2. That's an MMO FPS game while this is a CCG.
It is not "anger" that I feel towards you, it is; pure, unadulterated amusement. Because you are the only one here that is angry, with your deep seeded hate for Greninja.
WE DON'T KNOW WHAT THE META IS GOING TO LOOK LIKE NEARLY 9 MONTHS DOWN THE ROAD FROM NOW. STATING THAT IT IS GOING TO BE LIKE YOU SAID BASED OFF OPINIONS AND NOT FACTS IS FOOLISH.
I felt that it was required to have it capitalized, bold, and underlined just in the hopes that it would get through the haze of hate that you have.
tl;dr Your logic is bad because it's actually just opinions and poor comparisons. And you should feel bad.
Ps; Don't bother typing up some angry reply, I won't read it. This conversation is now over as it will just go in a circle, leaving you blue in the face as you try to convince me. And leave me breathless as I laugh at your replies.