I have been making large prints up to 24x36. I have found that 200 dpi is sufficient such that I can't see any quality difference with more pixels. Even 24x36 is a logistic issue for me since I cannot print higher than 17. So I have to purchase 24x36.
This means that 30 mp would be sufficient for most of my prints, and many of my largest prints are stitched anyway. The AA filter is the main downfall.
The 24-70 f2.8 mk2 is nearly as good and in some cases better than the new rf28-70 f2 in the MTF charts in the white paper. The 11-24 stands alone so far. Both lenses are sufficient to my needs.
So, if I got the rf, it would be with the drop in filter adapters and just use my existing lenses.
But, a week on the road is a long time to be away from home due to stuff only I can do there. I manage this 2 times a year. For the rest of the year, 2-3 day trips within 200 miles of home are the norm and only 2 or 3 of these a year. The rest of my photography is limited to spring of fall local stuff, which I have just about worn out. I have to question the need for a new camera let alone a new system