Malcolm Wilson has the best idea when it comes to the future of the WRC. Have R5´s with bigger restrictors. (And my say would be limit suspension travel, aerodynamics, and tire widths.)
Almost the same pace, but on 40% of the cost.

That would mean a lot more drivers - and teams, both private and factory - could enter the WRC.
More drivers in competitive cars is far more important than shootouts etc.

Look at Supercars in Rallycross - semi-private teams with spectacular cars, and a lot of drivers. And above all else: MORE POWER THAN GRIP

Ogier would still win, but he could be challenged on a more regular basis from more drivers than Latvala, and a few others on a few other occasions.
A three car, or even a four car team rule where the two best score Championship points, would get more specialists, and more young drivers to get a chance for a drive.

The classes in the WRC should be:
4WD
2WD (R2)
Junior (R2 max 29 years)
Make a seperate TV/Web/ package of also the lower classes (2WD, and Junior combined), to get more audience, and use this as a billboard for the WRC proper.

And build up a strong ERC, to be a real feeder series for both drivers and teams.
Set the total number of events low, maybe 7 rallies. 1 snow, 3 gravel, 3 tarmac.
This way the ERC-teams can do the full series on a sustainable budget, and national level can do most of these events on a "normal" budget, whit out it clashing with to many national events.
Have these classes:
4WD
2WD (R2)
Junior (R2 max 29 years)
And cut the age limit on the Junior ERC deal, call it ERC 2WD and ERC 4WD.

R5 is a big success, and there is already a lot of cars present. If these cheaply could be run as WRC-cars (bigger restrictors), there are a lot of cars out there.
R2 is a big success, with a huge number of cars. Build on that both in the ERC and the WRC.
R3 Maybe more relevant on a national level?