They really could've just gave the armor to Rhodey's... was that his sister? or niece? From his last mini series. But doing so would serve as a reminder of Rhodey... and we can't have that! Hence why they killed off the Hulk right after to overshadow Rhodey's death, so he'd become an after thought for an event they swore his death was necessary for. (it wasn't).
Riri is probably in trouble, long term. Miles has already crossed over to mainstream, so there's value in him even without the character protection. He'll be a presence in mainstream media, even if his comic sales fall.
Riri however...