US bubble?

$Dow Jones Industrial Average(.DJI.US)$ sooner or later, there will a bubble collapse in US, all of the assumptions are based on Credit, High PE for most of the companies. Who really will wait for 30 or 40 year for your high PE to have their return back. Continuing Low growth in profit for almost half of the companies in US in 2021 and 2022 but still able to push up the market. The world economy is dying but the fund is going back to US because of the high interest rate and currency exchange rate.  In short, it might be pushing up the market, in long, it will create a worser situation. Just a question, who will help to support the growth expectation of US stocks? Merely the US local market is sufficient? i dont think so.