I doubt this will be an issue. The line real estate is owned by the airport and the airport, along with its airline customers will dictate how the lines are set.

Remember, many airport managers and their airline station manager counterparts have a rather tense and often unpleasant relationship with the TSA and will not permit the TSA to dictate customer service issues on airport owned real estate.

Many airports also fashion their elite lines to blend into the same ID checker station. If, for example, the TSA screener checking ID refused to take customers from the elite line which blended to the regular passenger line, or used delay tactics to hold up elites in favor or non-elites, it's highly likely the airline station manager(s) and airport managers affected by this would go ballistic on the airport's screening manager.

Many of the airport managers I have spoken to over the past year or so are just cruising for a good fight...often because the FSD will just poke at them to try and assert authority. I had one airport manager tell me how a FSD pulled a middle-of-the-night AOA breach drill and tried to write up the airport because she could get on the AOA in the middle of the night without ID or being stopped - regardless of the fact the FSD wasn't even authorized to be in the AOA, ever. Needless to say, the counter-attack from the airport wasn't pretty

So don't worry too much about the line format just yet.