Like I said, a lot of health care policy wonks in 2010 were definitely expecting the exchanges to be where the action was, and were talking about future changes that would allow employer subsidies onto the exchange or for higher wages in exchange for breaking the link totally (health care wonks have long hated the link between employment and health insurance- it's a weird legacy of WW2 that doesn't make sense). This is why Congress and their legislative staffers are the only people who do have employer subsidies on the exchange- the GOP offered a poison pill to force Congress to only be offered insurance through the DC exchange, but the Dems gladly accepted the pill because they thought it would mark the way to the future. This did require a lot of extra rule-making and pipe-fitting such that the (quite poorly paid) staffers didn't get screwed too badly on the deal, which took an extra year, but since 2015 Congress has only been offered health insurance through the DC Exchange, the same as anyone else who lives in DC. Because the GOP thought it would embarrass the Dem's and the Dems thought it would instead mark the way that everyone would go.