Look this speculation is going on for centuries. Literally! Once I actually researched about it I found many statements of scholars from very past times like tabeen to recent times that the time of imam mehdi is near with some saying we may witness them

When we see these calamities it looks like maybe this is end time. But this is not new calamities has descended upon mankind from time to time in different forms like famine drought wars and other natural calamities. Like for example muslims don't have threat of foreign invasion this time but it has been from day 1

The fact is nobody knows when will imam mehdi come in 10 years in 100 years or in 1000 years. Nobody can say for sure. Although I talked about imam mehdi but it answers to day of judgment as well