I know what you mean, but also what the other posters mean as well. Israel was always a nation (actually nations buts that's another topic). I think it would be clearer to say that in 1948 officially recognized the land as Israel's again. So in 1948 and the first tetrads had to do with the land. The second tetrad had to do with Jerusalem, again a location. Possibly this last tetrad will have to do with the temple as I see a lot of tension and activity building there in recent years, enough to soon make a war over. So you see, it keeps focusing in to a smaller and smaller area and land of promise.
Tetrads, per se, are not predictive of anything. Rather, since they occurred at the feast days it captures attention. The sun moon and stars are merely God's giant clock hands to see the times of the feasts. The eclipses are merely his alarm on that clock to wake us up showing something is about to take place, not necessarily at the time of the eclipses, though. I do not think these eclipses are anywhere near the end times ones before the Day of the Lord. People ask "what if nothing happens"? It already has -- God caught our attention to watch, didn't he? More and more people are now questioning traditional holidays and looking to the biblical calendar and can finally see that those feasts are the sum total of all the prophets, Revelation and God's plan. Understand them, and one understands all of the bible and prophecy.