It looks like the England and Wales Cricket Board is going ahead with an inter-city Twenty20 competition, provisionally starting in 2018. The plan is to have teams in eight cities, playing at Test cricket grounds.
I'm not a fan of shorter forms of cricket like Twenty20, and not sure about inter-city sport either. In the mid-fifties, the Inter-Cities Fairs Cup, the predecessor of the UEFA Cup and Europa League, began as a tournament between representative XI's from different cities (London, Frankfurt, Milan), although some (Birmingham, Barcelona) were effectively just the clubs of that name, before switching to club sides by the end of the decade, and in the mid-nineties, when rugby league switched to a summer season, the new European Super League narrowly avoided the monstrosity of merged clubs, with the owners eventually voting down the proposal that, amongst others, Warrington should join up with Widnes as Cheshire (!) and Salford with Oldham as Manchester (!!).
I can't see the teams which play in the new competition at Old Trafford or Headingley being any different to the Lancashire and Yorkshire county sides who currently play Twenty20 cricket there, or attracting more fans under their new names.