There really isn't much in the Class A world on the horizon from a 'Major' manufacture who can produce a workable chassis with the economy of scale that Ford or GM can or could have. There have been a few potentials that show up with a one of cassis at the major trade shows been I've not seen anything beyond that.
Any start up is going to have very steep hill to climb to get a coach builder to want to take the risk and build on an unproven chassis. Maybe in a few years when new coach sales improve they might be willing to take the risk but I think at the present time it's going to be Ford for a while.