My belief has been that the Bible is perfectly clear about the things that are important for us to understand. All the other things are up for interpretation. Personally, I don't think it's necessary to understand all the prophecies and riddles in the Bible, though many may have an intellectual curiosity.
The Bible is clear enough on the way I should live my life and the relationship I can have with God. Anything else is speculation, and my eventuality won't change just because I may know exactly what it is.
That being said, I think it's accepted by basic christianity that Christ began ruling when he ascended to heaven. During Jesus' entire ministry, his disciples were expecting his power to be on earth, and that he will be a very literal king, and bring about a new "system of things", so the questions they asked him were referring to when his kingdom would be established right there, before their eyes. They just never "got it" when Jesus kept telling them his kingdom wouldn't be of this world.
I also think it's accepted by basic christianity that he will come again. Different religions place that coming in different ways, but there doesn't seem to be any reason (except the JW's) to expect it to come in our day any more than any other time in history.
Jesus told us we don't know when it will be, and I can live with that.