I agree there could be vast improvements on Downtown Disney. It's really nothing more than an outdoor shopping mall. I remember the Downtown Disney at Disney World. When it opened there were several Disney owned stores. Disney then consolidated all of those small stores into the World of Disney store and then got new corporate tenants in the other stores, and that seems to be the direction they're taking in the non-theme park locations of both Disneyland and WDW resorts. Rumors have it that more corporate restaurants and shops will be going into Pleasure Island at WDW.
However, I do not think they should re-route the monorail. First of all, there's simply no need for the cost. One of the most special parts of taking the monorail over to the park is when the monorail glides into the park through Tomorrowland (I like taking the monorail at WDW from the TTC to EPCOT as it goes into Future World also). Why take that away?
Also, I don't get to Disneyland nearly as often as I'd like anymore, so the likelihood of "persuading" me once I'm in the park of leaving to go to a shopping district is pretty slim. And considering how busy the park gets sometimes, if you leave the park and may not be able to get admission back in, it makes the persuasion that much harder.
I would, however, like to see more of a themed look to the area.