Hi again!
Okay. I've read all the answers and want to make a small summary for
myself (IMHO):
1) The MOST important: I think Wikipedia's markup complexity problems
are not the problems of Wikitext idea. I think WP should concentrate on
improving WP-specific markup (tons of various infoboxes and etc), maybe
move some templates to extensions, instead of changing the wikitext
totally or even worse - hiding it from the user.
2) I still beg MW developers to not throw the wikitext idea away!
(maybe if it will prove being useless for ALL (100%) users one day - but
I'm sure this day won't come). Visual editor itself won't harm anything,
I will support it. But I'll say my users: if you want to make small
changes, here is the visual editor. If you want to write something big,
here is the plaintext.
3) I see there are usability talks. Improving usability is good, but
targetting at people who don't want to be "technically proficient"
(emphasis: DON'T WANT TO BE, not just "ARE NOT") and just want to press
a magic button and "that's all" is not good. There are topics like
"internal vs external links, users tend to find one and ignore other" -
that's ridiculous, that's NOT the usability problem. I.e. I think we
shouldn't think of "usability initiatives" as of 100% correct ideas.