Will WIKIPEDIA-articles be changed over and over again, without ending, without reaching perfection ?

Wikipedia will always change because history can change, such as planetary changes (like Pluto is no longer classified as a planet) and celebrity pages (since their lives change on a daily basiis).

I believe so. That's why I don't use wikipedia.

Thats a great question. I would think that it would eventually reach the point where it changes extremely infrequently.

Wikipedia articles are constantly changing since the world is constantly changing. In this way it is good as the information is always updated. This sometimes causes other people to think that anyone can just edit or change articles to be incorrect but that is not true. The change in articles must be thoroughly proven and sited and most changes are monitored so that Wikipedia can be counted as a factual source.

yes....It will never be reliable...... most of the information you see there is not true...

Of course they will. For example, if I look up an article about a musical artist, I don't want the information to be from 2004! I want info from the latest week or month.

It shouldn't be referred to as "changing", but rather "updating".

It depends on the articles themselves. For example, the historical articles will soon stop being edited (if not already), having reached perfection. However, other, more recent-referring articles will be continuously edited. However, I do not believe wikipedia will ever stop being edited -as long as it exists.

Wikipedia articles are meant for updating, and is encouraged there. Absolute perfection is not a goal on an article, it's to make a factual article that is accurate while maintaing a neutral point of view.

No because after a while the adminstrators will lock the articles so it cannot be changed?

A great question which few people actually get. See, there's a sort of grading for articles. They go, in order, as: Unassessed, Stub, Start, B-Class, Good Article, A-Class, and Featured. An article is "finished" once it reaches A-Class status, but it will naturally still be edited and updated as events go by (unless it's about something that happened long ago that has little chance of being changed). People will naturally try to get all articles to Featured status, since Featured articles are the select best of Wikipedia.
A Good article can be traduced as a "decent" article, so it's actually good, but it's still not quite finished. B-Class is almost to being a decent article. Start Class articles sort of get explained by their own name (they're a start...) and Stubs... well, they're the bottom of the scale. Unassessed articles haven't been assessed yet (duh).

Each article IS perfect; it is in it's best form for the current moment.

You knew that, though.