***This post contains SPOILERS for CAPTAIN AMERICA: CIVIL WAR.***
The ending of CAPTAIN AMERICA: CIVIL WAR is powerful for several reasons. There's two Avengers teams now, Tony Stark is a broken man (still? again?) learning that the Winter Soldier killed his parents and this was known by Steve Rogers, who never told Tony. Also, the Winter Soldier's whereabouts are unknown once again as Steve and T'Challa are hiding him in Wakanda with the hope that his brainwash programming can be removed by the world's most advanced technology. (Another rub that Tony probably doesn't like being that he's the tech guy.)
But the most important thing at the end is that Steve is no longer Captain America and he is simply just Steve Rogers — a man in hiding from the world's governments due to his refusal to sign the Sokovia Accords. This is why he has what is pretty much considered the Marvel Cinematic Universe' version of the Secret Avengers now.
Directors Joe and Anthony Russo spoke about the ending, to Empire, and what it means when Steve drops the shield.
“Dropping the shield is a rejection of the Captain America identity and a choice to embrace the Steve Rogers identity,” Anthony says.
"[Steve is now a] full-blown insurgent," Joe adds. "The most interesting thing you can do... is to take him from a patriot in the first film to an insurgent in the third movie.”
In case you're not a comics reader, this played out similarly in the 'Captain America No More' story arc where the U.S. government learns the secret identity of Captain America and declares his shield and costume U.S. property. Forcing Steve to make a decision of if he wants to continue being Cap. If he agrees, then he had to serve a group of suits who would decide deployment. Within 24 hours, Steve said no and gave up the shield so the government chose a new Captain America.
While the MCU is not a direct adaptation of the comics, the movies do take a lot from the source material. So if the 'Captain America No More' story arc is to still serve as some basis for Steve Rogers in the MCU, then there's a good chance the U.N. and its Steve Rogers-less Sokovia Accords might start looking at another person to wear the suit and wield the shield in upcoming movies. (Just some quick speculation there.)
Meanwhile, Steve Rogers seems to be fully embracing the 'Commander Steve Rogers' version in the comics (image above) which could possibly see Chris Evans don his favorite Cap costume in all of the films he's been in... the stealth suit from the beginning of CAPTAIN AMERICA: THE WINTER SOLDIER.
The stealth suit was taken from Steve Rogers' look in the comics and there's no reason to not go back to it in a newer and more modified look (gotta sell more toys!). Steve broke into a museum to steal an old suit at the end of The Winter Soldier, and he broke into the Raft to free his fellow Avengers at the end of Civil War. The point being is that Steve likes to break into places and it would be cool to know that he did it again, but this time to get his stealth suit.
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