While I was driving, there was a podcast playing, and I believe that I heard the man mention a couple scriptures.

I didn't hear him make a conclusion, but he might have, and I may have missed it.

Considering that not long before, he had a preterist on his radio program, who tried to prove his point by one scripture.

Then it hit me, and I realized the point that he may have made, but I missed.

I'll try to explain what came to my mind:

Luke 11:16 And others, tempting him, sought of him a sign from heaven.

  29 And when the people were gathered thick together, he began to say, This is an evil generation: they seek a sign; and there shall no sign be given it, but the sign of Jonas the prophet.

That generation, in that day, sought for a sign from heaven, which they would not get.

But they would get the sign of the resurrection.

But in the future, there will be a generation that does get the sign from heaven:

Matthew 24:30 And then shall appear the sign of the Son of man in heaven: and then shall all the tribes of the earth mourn, and they shall see the Son of man coming in the clouds of heaven with power and great glory.

Clearly they are two different generations.

The later generation gets the sign from heaven that was purposely kept from the previous generation.

The preterist tried to prove that everything happened in 70 AD, by the following scripture:

Matthew 24:34 Verily I say unto you, This generation shall not pass, till all these things be fulfilled.

He tried to prove that generation in those days saw everything.

But they did not see the sign from heaven that they asked for.

The generation in those days saw everything that was to be fulfilled in those days.

Also, that future generation will see everything that is to be fulfilled in their generation.

They are two different generations.