they just need to change them to being called designated players and relax the rules on who can be signed as one (make it anyone can be).
The main advantage of a marquee isn't usually the player itself, but that it significantly raises the average wage of every other player being fitted under the cap. Giving clubs the ability to place any player as their designated player gives that advantage to all clubs rather than just those who can afford big name marquees - it effectively raises the salary cap, while still allowing teams to sign big name players.
Isn't that exactly how it works at the moment? Eugene Galekovic was a marquee as an example. All teams can make any player in their squad a marquee. I have never heard of a marquee being denied because they weren't enough of a big name.
This ^
Don't think i've heard of a case where the 'marquee' rules were actually enforced? We made McKain marquee didn't we?