Hi,
I will answer your questions one by one .

[i] The problem faced by different fedora desktop users are different media format incompatibility , some of them cannot enable the the compiz effects due to lack of 3d accelerated video driver support . These are the basic features a Desktop user wants.
[ii] Nothing can be done or rather nothing should be done as it might hurt the free spirit of Fedora.

[ iii] Basic desktop users are switching to pirated closed source software. And I think piracy not only hurts the proprietors of closed source software but also open source software projects as they get the pirated software for free.