All these things will be a challenge to them that pin their understanding on physical things. Right from Genesis 1, physical things have been used but more significantly as a prophesy of what was to happen spiritually in the end times which started in the 1st century - all that, is what is referred to as the law and the prophets which is basically all prophesies including the wars that Israel fought, anyone saying there's going to be a third temple is still dwelling by the law.
The devil is a liar, he makes these things appear so, physically so that people are deluded even more. A third temple could be built, a world leader could emerge and sign treaties with Israel, there could be worst wars in the middle east and physical Jerusalem could be destroyed- but all these will serve to lie and through these lies, the devil will capture many.
The basics that you need to know, spiritually speaking:
1. Israel/Jews means believers
2. The temple of God means the elect/believers- their hearts
3. There's two groups of believers;
- Jerusalem- unfaithful believers aka Church of Smyrna. These are killed and have their faith refined through fire/tribulation
- Judah - Faithful believers aka the Church of Philadelphia aka 144k faithful Jews. These are faithful because no lies (from antichrist) will be found in them. Basically means that they know God.
So, when Jesus says "..when you see Jerusalem surrounded by armies, let those in Judea flee...", He doesn't mean it literally, He only means certain group of unfaithful believers will be flattened and have their faith refined by fire while the faithful believers will escape tribulation.
And all these things are happening now, they were happening in the 1st century and will continue until the end of age that is determined. The reason Jesus said that at the end of age will normal, people will be eating and drinking, marrying and being given to marriage. There's not going to be an intense moment of wars that will bring the end, the wars being spoken of are against principalities and powers in the spiritual realm.
Another truth is, the antichrist is not a physical being either. People have been worshiping the antichrist for 2000 years now and we are almost there, trust me.
The end of age is also not imminent, it has been declared in the prophesy but who will understand?