Because this is 2019. Just look at the current roster of Disney movies coming out, all remakes desperately clinging to IPs to a fault. Same with Hollywood and the gaming industry, you need to have an extra-solid pitch to convince one of the big companies not to strip the heart and soul out of a series for profit.
So yeah, it is possible for one of the execs to go “Yknow, we kinda did catch lightning in a bottle with G4, even got a buncha free advertisement from those older creeps, how bout we play it safe and just… reboot that generation?”. Welcome to the Worst Timeline.
I definitely think G4 and G5 will be a LOT more similar than G3 and G4. Going back to Transformers, aesthetically and to a certain extent plot and tonewise, Transformers Prime was a LOT like the movies. A separate (infinitely superior) continuity, but the similarities were there.
…I’m not sure this is a bad thing. I like G4, and seeing them do something similar while hopefully fixing a few of the issues the setting has historically suffered would certainly sit right with me.
I mean what’s the alternative? Ponies IN SPACCCCCCCE? Ponies in a high school (done that). Ponies Unleashed, with all new edginess, swearing and sex jokes? Ponies in live action? Newborn cuties V2?