It is possible. We don’t know what Twilight Sparkle’s reign was like, it is shrouded in mystery - but from what has come to light, it seemed to have had a strong impression on the whole world. The cutie marks on non-ponies are so far the strongest, but not the only proof that the reigning princess and her friends together with their relatives from Ponyville had left their mark on the world. It’s possible that Twilight, who according to Opaline had an empire encompassing more than just Equestria - as Spike indirectly confirmed, had created a sort of “United Nations” between all realms in the air, on the ground, and at sea. She could have been world ruler in her time, before the magic disappeared - which seemed to have happened after she disappeared. It is possible that the G5 world was created by Twilight, although Opaline indirectly had a hoof in it, which could explain why G4 and G5 are different worlds.
Perhaps there is an abandoned throne out there, hinting at the carpet that heralded Sunny as an alicorn ten generations before, awaiting Twilight’s successor. And it’s possible that Spike’s remark that Sunny could make a worthy princess may have been because he may feel that the world needs a new representative who can revive the ideals that his friends had devoted their lives to. But the carpet revealed that Sunny is not sitting on the throne, which was left empty - which could suggest that she has the right to choose. If there was a “Friendship Empire” out there that Opaline had undoubtedly wanted to take, Sunny needs to learn about this.
But this is currently unattainable, because Discovery - which has now almost completely broken with Hasbro - refused to give up the G4 rights which may not become available until a year from now. Which could explain why TYT is on a “low budget” to drag out the time through 2024, where there is a focus on G1 and available G4 materials, such as the royal sisters’ diary from which the story behind Skyros comes from.
So Sunny and her friends must then find themselves staying in their part of the world, even though TYT has given us openings about the dragons and sea ponies that will appear later in the year. We have learned that there are secrets surrounding Sunny. It is possible, as seen with Misty and Izzy, that Zipp, Hitch, and Pipp will have their “elemental awakening” episodes. Not only will Sunny learn about the other alicorns and their home of Skyros, they will also learn about the motives of Allura, who is not a ruthless villain but a mysterious antagonist on a quest that is connected to another realm and that has to do with her brother.
There is a lot to go on before the G4 lore will be available.