The Marvel Cinematic Universe (MCU) has always been interested in Infinity Stones since the very beginning. Yes, I mean it! Even Captain America was into stopping Red Skull from using the Tasseract before he became a “Capsicle” (pun intended). Captain Marvel had received her amazing powers with the exploding of an energy reactor directly connected to the Tasseract! And if someone doesn’t know at least the plot of Infinity War and Endgame, he or she has been living under a rock! I AM SERIOUS!!!!
So, what would happen if there were no Infinity stones.
The first thing that comes to our minds when we think of Infinity Stones are the words, or movies, “Infinity War” and “Endgame”. While it is true that these would not exist, it could also be true that these two movies will exist, just in a different way. Maybe Thanos would find a way to try to obtain the whole Universe and “Make it right”. A way, Marvel hasn’t introduced yet. The next thing that comes to our mind, is Red Skull. Red Skull would not have died and maybe Hydra wouldn’t have been formed if there were no Infinity Stones, because the main and primary aim of Hydra was to acquire all the Infinity Stones. Next we think of the Captain Marvel. As everyone knows (hopefully), Captain Marvel received her amazing powers by absorbing some of the energy of the Tasseract. This made her the most powerful Marvel character (my opinion). If there were no Infinity Stones, she would have been just a normal person and would not have gone to another planet, plus there would not have been a plane crash (from where she learned about the stone). In “The Avengers”, Loki had come to Earth to get the Tasseract and to conquer the planet. He would not have done that and maybe would just come to Earth to conquer it. I think that the whole web-series Loki, would not have taken place and he would not have been a variant. Coming back to Infinity War and Endgame, Natasha Romanoff (Black Widow), Heimdall, Loki, and specially Iron man, would not have died!
Vision literally would not have even existed! Which would technically mean the Wanda would not exist… Kind of…
Therefore, I think that Infinity Stones are and will always remain an important part of the MCU and is already the reason that so many heroes like Captain America and Captain Marvel would not even exist.