I think it's a great suggestion for future implementation that caters to both hardcore and casual players. In any event I think that on a slightly longer timeline casual players would be able to get to 50 at some point anyhow and so would not be barred from getting the r.50 jobs either if that's what they wanted.

The argument against it could be that casual players want the lvl 50 jobs too without the time required to get to 50 but that's neither her nor there because the "I don't have the time to invest but still want x or y" is an eternal argument made against every idea ever proposed. You can't please everyone, and that's fine.

And as a small point a 1:1 ratio for classes to jobs is kind of limiting. Even if their system is only 2:1 and not the 4:1 you're suggesting either case is better than 1:1.