Perhaps the RFL has to consider the consequences of the loss revenue that your plan would lead to?

How would you replace the lost revenue generated from the play-offs, including a 70,000+ crowd at Old Trafford, and the reduction in TV revenue?

There would not be a loss of revenue. Teams would still play the same amount of games , excluing the , Magic weekend.
If the weekly rounds were more meaningful more people would attend, and not take the attitude that it doesn't matter because it only matters at the end of the season.
The Grand Final should still attract the same crowd, as it does now, as they are still competeing for the same trophy. I haven't said anywhere to scrap the Grand Final Trophy playoffs.

What do you mean they are playing for the same trophy? You've already said the Grand Final has been replaced as the major trophy by the league table champions.

Do you seriously believe that a "Grand Final" that was in effect an post season jolly would attract a crowd of 70,000+?

To be honest if you think this then you're probably right; you are too simple for the RFL.

I think Magic Weekend is one of the few 'innovations' that the RFL have come up with in recent times that has been successful. I personally loved it and go for the whole weekend every year. One of the problems for me with Magic is that there are too many fans of their club and not enough fans of the sport. By which I mean, some fans are only interested in watching their own team and won't bother with any game that doesn't involve them, making Magic weekend a waste of time & money for them. I'm a fan of the sport and will sit through all the games over the weekend and thoroughly enjoy it. This is the same problem we have with the national squad. Too many people can't leave their blinkered team bias at the door.