Well an installer would be nice to have of course, but there are problems associateed with it:
A good installer has to be able to be run on any system with perl on it and how are u going to embrace all the different soft- (i.e. win, linux, mac, bsd, etc) and hardware (x86, PPC, S390, ...) architectures out there?
I mean even if u concentrate on linux u will have a problem: will it run on redhat? will it run on SuSE? and whats with debian or rocklinux?
So to put it shortly: In my oppinion it's definetly a nice idea but not the time for it yet. We first need a set of standards which everyone follows. The not-existing of these standards is as i see it the only reason why no general automated installers exist in linux. The only automated installers we have are distribution specific like rpm, apt-get, yast etc.
"WHAT CAN THE HARVEST HOPE FOR IF NOT THE CARE OF THE REAPER MAN"
-- Terry Pratchett, "Reaper Man"