Not only will they be competing against the import market, but an ever growing secondhand market.
Same thing that has happened in the marine industry, there is such a flood of good second nah boats driving the prices down, less people need to buy new.
With the popularity of camer trailers in the last 5 years, I suspect the same will happen. There will be many who will be selling because of lack of use, and many upgrading to a caravan or something. I think it's going to be hard for any manufacturer unless they can offer something new or different to drive people to buy new (and not run of the mill import).
Anyway, everyone is doing it tough.