MBT70 was an attempt at a revolutionary leap forward but in doing so it was (for the day) hideously expensive and stretched the envelope to breaking point. I've never quite understood the rationale for putting the driver in the turret. His location there caused all sorts of problems. Normally he needs excellent vision to the front and sides to allow him to do his job but they found putting him in a contra-rotating "turret" resulted in quite severe spatial disorientation because he could never be sure which direction he or the vehicle was pointing. His location in the turret also interfered with the commander's vision (the normal location of the commander at the heighest point of the vehicle offering the best vision was partially blocked by the drivers turret).
In the "low-cost" version of the MBT70 which was developed from it, the XM803, they returned the driver to the front of the hull.
The XM803 in turn led to the M1 Abrahms by a roundabout way.
The hydrodynamic suspension of the MBT70 offered considerable potential:
But apart from the Strv103 ("S Tank), only the Japanese Type 74 adopted anything similar. With the development of gas turbines and 3 axis gyro stabilisation for MBTs, the emphasis changed to fire on the move and the idea of sneaking up to a reverse slope position and sniping at the enemy got left behind, so hydrodynamic suspension got abandoned for MBTs.
Some of the development vehicles offer some interesting ideas though:
Improved electronic Fire Control Systems with cheaper and easier to use computers also spelt the end of the Shillelagh gun/missile system, which the Germans were always a little leery of anyway. They planned to use a 120mm gun on their modified version of the MBT70, the "Keilor" anyway, if they had adopted it.
