The tank isn't dead because armies still need the capabilities the tank gives them. You need a long range direct fire weapon, capable of engaging armoured targets and infantry (canister or airburst rounds), with rapid engagement of multiple targets, low time to target, rapid reloads and follow up shots, and high survivability. Lighter wheeled gun armed vehicles can be cheaper, but they don't have the survivability. T…
The survivability property is the one being questioned right now. If you can attack a tank from 5 clicks away with a high probability of success then air support and infantry have to cover a really wide perimeter inviting the question if the resources spent on the tank can give better capabilities in other form.
That's the point so, there is no other system that can give those capabilities for now. Seriously read the article, it is pretty good on that topic.
In terms of tank usage, they are also quite good in when directly engaging fortified positions, e.g. field bunkers and so on.