You are correct, because the current implementation of the electoral college is currently synonymous with "winner takes all" in all but two states - ensuring no opposing party turnout in states that are a foregone conclusion. If the winner-takes-all system were removed but the electoral college were still intact, Democrats would never win another election.
I don't think that can be right. The Democrats have recently won both the House and the Senate. In such an election, if "winner take all" is abolished, how would they not win the presidency?