It could easily become part of Iraq. None of the states of the Arabian peninsula have a military which can defend its own borders and Obama won't commit troops to defend oil after spending six years championing "no blood for oil".
I always see the worst side of things, and I would avoid major cities for a while. Once we're fully withdrawn from Iraq, the country will fall to jihadists and they will likely be expansionist. They'll be less harsh subjugating minor cities and suburbs.
Daleks were cooler when the 3rd Doctor went forward in time to when they were invading Britain and there were 1950s British troops in the future fighting with bolt action rifles and PIATs. Ever seen a PIAT hit a dalek? It's epic.