I would be very, very surprised now if this isn't the end of the longest bull market in recorded history.
As I write, FTSE futures are sitting around 6080, which would be about 23% from its (2018) highs, so officially in bear market. Many other stock indexes will also be entering official bear market territory, and I would expect the US to follow.
There is no doubt that when you look at the Fed's loosening programme, which has been ongoing for a year now, the signs are that economic conditions were deteriorating anyway, and with the further damage inflicted by Coronavirus, the markets that were priced for perfection are now adjusting to the new, somewhat less than perfect reality.
I started buying the FTSE last week and will probably deploy most of my remaining cash continuing to buy it this week. Totally in contrast to the US markets, it actually looks cheap based on CAPE and Buffett indicator values, yielding 5.3%, and looks like it will be cheaper still when the markets open on Monday morning.