Obviously, if there is no room for proper fasteners, it is a design problem. There is no way that Leica and Zeiss use Loctite to hold together mechanical parts of their lenses, they use it for locking the threads on screws. Does anyone know where these lenses actually originate? I know the earlier "Noktor" m4/3s lenses were re-purposed security camera lenses. Maybe this lens uses the glass from similar lenses (though with larger coverage) and they cobble them together to make an m-mount lens?
Of course people can spend their money on whatever they would like, but it just seems illogical that anyone would pay $5000 for this lens rather than an F1 Noctilux that won't fall apart when the loctite melts. But I guess you could go for the non-RF version and save $2000! (btw, $2000 + another $1000 gets you a new Summilux Asph) Leica couldn't ask for a better competitor to make their lenses look like a great value!