A question about use of 为止
It is better to learn "到此为止" as one compound word.  For example, 今天的会议就到此为止吧. The meeting of today ends right now. "到此为止" implies that there may be more issues but will be handled next time. It is somehow different from 今天的会议开完了. The meeting of today completed now. 

Also it is better to learn "是否就到此为止呢?" also as a whole phrase. This question implies its answer, such as, "显然不是!" Instead of a question, it is a way to emphasize the answer. In English, "Are these all of the problems? No, definitely not."

You also mentioned "until". That is a different usage. Such as "直到...为止. For example, "我们不能回家，直到把这个题目做完为止. We will not go home until the project is completed.