The first tests of auto take off at Airbus were in 2020, it’s downhill from here. Every facet of transportation is getting automated. Line haul automated trucks are less than a decade away. The cost savings of halving your pilot numbers are huge...
The easiest form of transport to automate is trains. How many driver-less trains with passengers operate in Australia, or the US or Europe? Next easiest is shipping. Heck they already "need" pilots to bring them into harbour after the ocean crossing. When I see mostly driverless trains and a few automatic ships, then I will know that single pilot aircraft are coming, because if you NEED one pilot then you NEED a second one just in case.
By the way, crew costs are between 10-15% of aircraft running cost. That is ALL crew. maybe the cabin crew will be first to go? No cabin attendants on trains or buses. Find your own exit.
When in 2020 did these tests occur?