well, its time for some changes in the wrc, but i dont think this is the way eighter.
one of the biggest changes with the possible best effect is to ban the ridiculous homologation rule.
then the manufactures is out of the game, yes, but we will see many more different cars, drivers, team, fans and so on. in a much lower expense for everyone. its few manu's in the formula classes also, if the fia would get a homologation rule thru a manu, the formula one would be dead too.

get rid of the manu's, then we have several teams like msport, kronos, adapta, +++++ that could build and run different cars, make an easy rulebook that suits private teams, of course many of them would have some support from different carmakers, and of course those with the biggest budget would have, atleast a change to have, the best car. but this is motorsport and thats how it is.
then we can get those heroes we had for a long time ago, win a event in a selfbuild car, against all odds, lots of teams and cars on the start, cars would probably brake down easier, but that was a part of the game to.