... building up even more?

Good question, and there is a simple answer. It might be building up a little more, but then it will burst. This is as certain as the outcome of life.

All and every bubble in the world's economic history has burst. To know exactly when that will be is difficult to predict.

There are several reasons why this is going to happen. One is the phenomena of truth. The truth will always come out. Bubbles build up over time fuelled by economic progress and eventually this upwards trend is only sustained by money chasing the opportunities that have long gone.