I am not sure whether the original Q is serious, because the assumptions (too much traffic, can't get a word in, etc) are mostly incorrect. I did type up a reply and then IE6 crashed, as it often does with pprune.org - presumably to one of the advertising feeds containing some duff flash stream...
In short, there is no problem flying at 200kt+ with a decent GPS, and anybody navigating WW1-style just needs to hack it any way they can. 100kt gets pretty boring pretty fast if you want to get somewhere.