It's more than just that. If you remember Lauren Faust said something along the lines of "I had planned for all the ponies to realize their dreams. Twilight becomes a princess. Rainbow Dash joins the Wonderbolts. Rarity gets her shop in Canterlot...and it's so sad that I can't take them there."
Well...Twilight IS a princess. Rainbow Dash DID join the wonderbolts. Rarity HAS her shop in Canterlot. Heck, Rarity even said "I have everything I ever dreamed of...". It's all falling into place.
That said, I swear I read that Hasbro and the team have plans for the show for at least the next 5 years. That was in early 2014 I first saw that, so that puts the timeline running through 2019. Things changing doesn't mean the end, just that things will go in a different direction. It's already happened once what with the elements of harmony and all.