This needs to happen.
 
@Background Pony #A4A3  
If anyhting, I can see the G1 ponies being called out. G4 had Sombra, but G1 had Tirek, the Raptorians, Arebus, and Lavaan.  
And that was just the ones they outright killed…

And the pre-G4 ponies might call out the G4 ponies for being a bit more morally ambigous than them.

The concept of a Crisis Crossover between the four generations has potential. One thing I’d like to explore is the G3 ponies and how they would deal with things. Their world is so completely bright and innocent that they’re all pretty much children, never having to deal with anything more severe than party decorations. Putting them in a scenario where lives are literally on the line, having to deal with a genuine threat for the first time, it would be traumatic for them, but could also allow them to develop and mature.

@kruppenstein  
And the G1’s teasing the G4’s about being catsheep and not ponies XD

They should make something like Turtle Forever, with mane six facing previous generation characters drawn in their representative styles, with lots of meta jokes, like FiM ponies complaining about older ponies being so fat, or RD embarassed of her predecessor…

I know all the title references… I’m not going to say what they all and make me fell like an even bigger nerd…

That title $ound$ like $ome undubbed, unrelea$ed anime or OVA.

The world needs more Epic crossovers.

@Itsthinking  
STOP CRUSHING MY DREAMS  
but yes that is correct

Didn’t Hasbro lose their rights to most G1 and G2 characters?

I would give hasbro all my money I don’t care exactly what it’s about but I would pay handsomely to see it

If it’s well written and in G4 style: Bring it.

As long as its all in G4 style, I’d watch it