There is obviously a serious design fault here and they should fix it instead of trying to camouflage it with filters!
It's not very Leicalike!
There are actually two serious design faults. One was by God when he set up the laws of physics, and which Leica can't do too much about; the other was by Leica when they designed a rangefinder camera in the first place, and then got some people hooked on them.
If we want to use Leica M lenses, we'll have to put up with filters. The long, and often tedious discussions on the Leica forum suggest that Leica is being squeezed between competing design parameters. Leica has said they want to design the best digital camera for taking B&W photos (long a Leica speciality) along with color; that means extra IR sensitivity. You can't have both without having something that's removable; they tried to skate it and then deal with the IR sensitivity in C1 profiles, but people aren't buying that. So we need filters; so do some much more expensive MF cameras.
I personally like the compromise; I'm more than willing to screw and unscrew a filter occasionally; when I was shooting B&W with Nikon film cameras, I did it all the time, and have no particular fear of filters. In fact, as soon as I got a Noctilux, which for me is a pretty expensive lens, I screwed in a B+W UV filter simply for protection. It would take a far better eye than mine to see any difference in the resulting photos, between filtered and unfiltered.
I guess the bottom line is, if you really want a 5D, you should get one. If you really want an M8, this is what you're gonna get. Nobody's putting a gun to your head.