No one can precisely predict the time of bubble burst. There are still many ppl who are buying up and ignoring the looming risk. They are attracted by the profit.
Don't fight the fed, they have very deep pockets. The money in those very deep pockets might be imaginary, but as long as everyone is happy to keep on investing all of the newly printed money in the world into the markets, the prices will keep going up.
It will come tumbling down, but I wouldn't care to guess when. I think we might see 2500 on the S&P before we see 1500 again.