The country is carved in such a ridiculous manner, so yes. We've talked before about the death of "swing districts" due to gerrymandering. There are a few vulnerable congressmen on both sides (the guy who beat Allen West comes to mind) but overall both parties have created deeply partisan districts - and in republicans' case, these districts pull the party to the far right. Many of the districts have very low Hispanic populations, ensuring congressmen aren't punished by the upcoming immigration debate/death.
2016 at the earliest bro, but I don't expect it to change until 2020/next Census.
But we already saw Democratic districts max out their vote totals in 2012, when Democrats had a 1 point advantage. Give 6 points to every congressional Democrat and you'd have enough Democrats for a majority.
It's true that the dearth of real swing districts as a result of gerrymandering makes reclaiming the House much harder than it would be, but if Democrats post a large enough lead, it doesn't matter.
The biggest factor I'm curious about is how effective OFA will be at turning out voters. Turnout in midterm elections is muted in every demographic, but keeping young voters, blacks, Hispanics etc. at a high level of turnout will neutralize a more conservative, older white voting base. I don't think Obama has largely cared much about congressional races in the past, but
For starters, here's 7 House seats I think Democrats can pick up in 2014
CA-31 (This is a Democratic district where thanks to California's new primary setup, two Republicans advanced to the Nov election as the Democrats split the vote. Rep. Gary Miller is toast against a credible Democrat)
CO-06 (Mike Coffman, residing in a blue and heavily Hispanic district while railing against immigration reform and Obama. He only won by 3 points last year)
FL-2 (Steve Southerland. Democrats got a great recruit here in Gwen Graham, and this race was surprisingly close last year even though it wasn't on anyone's radar.)
IL-13 (Rodney Davis won by .1% against a perennial Democratic candidate, and Democrats landed a much better candidate for 2014)
NE-02 (Extremely close last year and the DCCC didn't even spend a dime. If Obama campaigns here where he's fairly well-liked, they could win it)
NY-11 (Mike Grimm has been slammed with ethical charges since being re-elected.)
NY-19 (Sean Eldridge is running here and is moneyed as hell.)
10 more to go.