firstly, installing any OS should never be a end user task. there are too many options and detailed selections that should be made for an end user (particularly one who doesn't know about partitions etc to make) You have installed Windows numerous times, I bet the first time you installed windows you were nervous about it all
secondly, I have stuck Linux live CDs in I don't know how many PCs and never had an issue. You denied any technical help from me so don't go saying 'It don't work' when ther was a 'tech support desk' sat here waiting. I doubt many newbies could make informed decisions about installing windows and would more than likely shaft anything that was already there. the fact you have a weird Gfx card that has no support from its manufacturer isn't the fault of teh OS. If they hadn't made windows drivers you would have had just as much trouble
There was a nice quote I heard today that seemd quite relevant
"Unix is user friendly. Its just particular as to who its friends are"
I've said many times before and I don't want/mean to sound arrogant. PCs are technical things, Windows has tried to hide so much technical stuff we now have millions of users who want to do Online Banking etc who have zero idea about security/viruses/trojans etc and get ripped off. So whose fault is it? the Banks etc for making services available or the users with no clue who get conned/scammed into giving out their details.
Will Linux dominate all PCs, No. It doesn't aim for that. the beauty is that its so much more extenisble that you will probably have a couple of linux powered devices in your home(and I don't just mean you in particular as I know you already do) before you know it.
With the likes of Dell offering Linux installed PCs where they are up and runing just like they do with the Windows installs things will get better. Once people realise that they don't need to go spending cash everytime they want a new software package the better.