You forgot "...as we wait in joyful hope for the coming of our Savior, Jesus Christ."
That line from the revised "Deliver us Lord" and the memorial acclamation you cited (...Christ will come again) are part of the new rite of the Roman Mass. If you're saying what I think you're saying (and I admit, I'm not sure) WHY would the Catholic Church have been teaching the Second Coming 200, 500, 1000, 1500, 1750, 2000 years ago (let's not fiddle with dates, just pick one of those as when you think the Catholic Church started and leave it at that) as something people needed to be ready for when it clearly hasn't happened yet?
Regardless, the point I was making is the mindless optimism (and I use that term with trepidation) that seems to regard all men as well intentioned was launched by Pope John XXIII and spread immediately into the Catholic world and from there flowed into the civil societies populated by Catholics. Although how "we're all nice people now" squares with a bullet proof popemobile I'm not entirely sure, I don't think they're thinking it all the way through.
The Catholic Church will preach the Second Coming when it's time, and maybe you need to consider that in the revised rite of Mass for the Church in the West there are indications of that which were not present prior to 50 years ago.
Do you understand what I'm saying here? There's no decent reason to preach the end of the world to people who wouldn't live to see it, that just gets people all worked up over something that doesn't actually have anything to do with their lives on this earth. To the point: it takes the focus off their own end and turns into a constant replay of the boy who cried wolf.
We, at least in the United States, have been subjected to a never ending "end of the world" cacophony since at least the mid 70s and two generations have died without it happening. How effect do you think "No wait, THIS time we really mean it" is going to be? You MIGHT contemplate who is behind all the noise what with prophecy after prophecy and prediction after prediction all having been false.
Beyond that though, people are dying today, did die yesterday and will die tomorrow for whom the Second Coming is/was and will be practically irrelevant in the sense of the consummation of the entire world but their own world has come to an end and for that ending they must be prepared.
With each end of the RC Church calendar year, the readings begin to focus on the end of the age.