"Yes, you have technically survived, but you haven't taken any points, and its nothing like getting 14SCs in a PPSC game, and this should be reflected on your record."
Points are artificial. The game's been around longer than the site; the scoring conventions devised for tournament play (and simply for comparing results) are prior to (in both Aristotelian senses) webdip's point system. The point system is useful for what it was designed for, but it's not an adequate alternative for pure scoring purposes to the win/draw/survival/defeat system.
"It is in the spirit of WTA that a 16SC finish is equal to an elimination, because the winner takes *everything*, there is no second place and no pride in supporting an ally soloing and surviving.
This should also be reflected on your record."
You seem to be describing a variant where WTA means not only that the winner takes all webdip points, but that the winner also takes one "victory unit" and anyone who did not win gets precisely zero "victory units". This is a peculiar variant. It makes people's common-sense judgments (such as that a survival with 16 supply centers is superior to a defeat, or to a survival with 1-15 supply centers) false. I am sure many people would like to play this variant, but I'll stick to Diplomacy.
"The current system encourages people to support solos if they can survive.
This is wrong."
Human nature encourages people to support solos if they can survive. There are many reasons for this. Some people are cowards. Some people truly don't care about winning - ask them! They really don't care much about winning and are perfectly happy just assisting another person to victory. I've met people like this. Although I think that perhaps Diplomacy is not the game for them, they haven't abandoned it, and will continue to influence the metagame (I'm using that term in a different sense than that in which it's usually used on here) as long as they keep playing. Most of us (certainly I) find it annoying that such people can play and ruin our games, but, hey, that sort of behavior's always been around.