From a technical/design stand-point (again), we can achieve, and
have already fulfilled, the fundamental elements of firepower and
mobility in the class of vehicles that we have of 'indigenous'
origin,
the real difficulty is forever the element of protection.
This will extend definitely to any development of a 'light' tank or
tank destroyer of our own undertaking, and somewhat degraded in
terms of the ability to attain the goal with respect to our current
efforts put into the vehicles we have at the moment.
As highlighted before that we are only as capable as how deep the
local military's pockets are, we can only make do with application
of available protective technology rather than to develop new
technology from ground up.
Therefore what I am saying is that, for tank capability, the
qualities:
mobility (speed, range, weight) and firepower (gun calibre, ammo
lethality, sensors, FCS and even BMS) - the answers are all out
there for us to mix and match to our best fit.
Things under protection like weight and volume of conventional
protection (active & passive armour) are the main killers to
ourselves, according to required and intended threat level
expected. Can only wish for real breakthroughs in the radical
areas, like electric/electromagnetic armour, plastic armour,
transparent armour and the like....