This may be sacrilege, but...
I don't think it would be so bad if they cut a few minutes off the trip time of the Mark Twain and Columbia by shortening the route north of the Hungry Bear Restaurant. It's easily a 25 minute process from the time you enter the dock waiting area until the time you leave the boat, and the trip itself takes about 16 minutes.
If they cut that trip down to 12 minutes instead, it would seem more appropriate for today's audiences and wouldn't make those boats seem so slow and boring to many people. It's like the difference between the slightly-too-long 15 minute MuppetVision show and the far tidier and faster-moving 10 minute Tough To Be A Bug show. Shaving three or four minutes off the trip time of the Mark Twain could do wonders for that 1955 classic.
I should also remind folks that the stretch of the river north of the Hungry Bear has offered it's own visual problems for the past 15 years, with the Mickey & Friends structure visible through the trees from the Mark Twain no matter how many new trees they plant and how much Miracle-Gro they pour on them.
Using the incredible visuals of Cars Land and Avatar Land as a guide for 21st century Imagineering on a big budget, fixing the visuals across Disneyland Drive and tightening up the trip time could be a nice improvement for the original 1955 boat route. Why am I in such a sacrilegious mood today?!?
If this rumor is true,
I'll be fascinated to see how this whole plan fits together over and around Disneyland's northwest quadrant.