Two things have rapidly changed the survivability of the tank.
The combined active protection systems that use both soft kill and hard kill modes.Soft kill is sensor based system that interferes or jams,disrupts the incoming weapon's target designator/seeker.Hardkill actually destroys the warhead either by direct impact or fragmentation.When combined along with sensors like radar warning reciever and laser warning reciever these will drastically increase survivability.
The other improvement is NERA or non explosive reactive armour.As u know the main counter to explosive reactive armour is tandem warhead that has 2 charges,the first one to explode the ERA and the next to kill the tank.But NERA doesn't explode,and thus makes tandem warheads obsolete.Most new tanks are switching to NERA.It also has the advantage of not having the problem of exploding fragments to nearby infantry.One drawback of NERA is it offers slightly less protection against KE penetrators.[the main tank to tank battle round]
But on the other side it way more lighter and unlike ERA can be placed almost anywhere in the tank.
What this means is we will see not far from now Tanks with welded composite armour that already offers superb protection,covered with ERA perhaps only in the frontal arc for tank to tank battles.NERA.aplique modular armour packages and slat armour covering the rest and an APS,plus RWR and LWR.This offers very high protection.
The advent of improved APS means the days of the RPG are numbered.The only way an RPG can go through are if they hit the tank from very close range,thus not giving the APS enough time to react.Or hits it from an elevated position say a roof on top,which will require the APS to intercept almost vertically against gravity.This makes the RPG's life very hard.
Same for ATGM.But ATGM's have a way out.The ultra new ATGMS like javelin,spike and trigat have a coded algorithm that ensures effective top attack mode.This makes it difficult for APS to intercept it due to vertical angle,but more easier than an RPG from a roof because that is simulataneously close and vertical meaning low reaction time plus vertical angle.While ATGms will be launched from a distance giving more time to react.
So yeah infantryman's life is getting harder.But i'm sure they will come up with something new.
The tank i would be in is leoa7
The mech thing won't happen,because of weight mostly.Above 70 tons is logistically unfeasible.And anything less won't be armoured enough to be a cost effective threat at that size.What we could see is automated robotic vehicles the size of ICV say BMP-T terminator without a crew,kind of like what we saw in the terminator 3 rise of the machines movie.Main problem is lack of technology advancement and enemy could jam communications with automatic vehicle.And then what?
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A bigger souped up armoured version of this is possible in some point in the future.