Do bullets make infantry obsolete? Humans die really quickly to bullets and the cost relation is horrible

Tanks might become obsolete, in fact NATO has been developing the concept of Strike/Stryker brigades as their main meat for a long time and those function mostly without MBTs as their primary armor. If they become obsolete it won't simply be because of drones, but because their tactical role will be filled by other systems or concepts.

Heavy armor in large columns has a big problem in modern peer conflicts in general. Minefields and high precision weapons combined with constant satelite and UAV surveillance make them incredibly vulnerable. Both Ukraine and Russia have struggled massively with this. Both have resorted to small scale infantry teams to circumvent this problem. Cluster munitions should, however, make this manpower intensive strategy even more costly and difficult. So that doesn't seem to be a good solution either in an age where manpower is sparse as hell due to demographic shifts.

The tank's role in this seems to have shifted too tho. From what we can see they're less effective as breakthrough weapons and more as short-range, direct fire, mobile artillery. In times of immense focus on artillery that still gives them a highly important role that drones don't really impact any more than they do howitzers, SPGs or AD for that matter.

Personally I think long term drones will mostly impact the role of the airforce. Planes are absurdly expensive to build ($80mio for a single F35, bombers can cost close to a billion), operate and maintain, so are pilots. Much more so than tanks and their crews. Missiles, drones and integrated AD, to me, seem much more economical than huge fleets of jets and bombers operated by incredibly vulnerable human meat while filling similar tactical roles. We can see this in Ukraine where air power plays a pretty small role, while tanks are still all present and sought after.