They are still reaping the benefits of the census data prior to 2020, where it will change and benefit the Democrats, finally, where the country will be a minority majority country.
States with the fewest electoral votes combined with the governors we elect in WI, MI, IL, MD, MA, ME and FL or OH will give us the electoral strength to break the GOP in the House, finally.
The country will NOT be minority majority in 2020 youre over 20 years too soon.
IL is already gerrymandered to the maximum benefit of Dems. When IL loses 1-2 seats, it will be Dems seats. MD, MA, ME have nearly no GOPers to begin with, so I dont know why you bring up thoses states.
The Dems best hope is in FL, OH, PA and MI. But it is not as much as you think given the Dem vote in those states is heavily concentrated in urban areas. To create a Dem House majority in MI would require even more absurd gerrymandering than the GOP has there now. The entire Dem vote in MI comes from basically four counties. Wayne, Genessee and Washtenaw and Ingraham but even that is less Dem than the first three. Without thoses counties MI is a deep red state. So winning the State Legislature and redrawing a majority Dem House in MI is near impossible. Same is true for OH and PA.
It works in IL because Chicago and Cook has proportionally more population in the state than Wayne in MI or Cuyahoga does in OH.