Battlefields of the future are going to depend a lot on speed. Tank development with the enhancement of speed is key like the US M1 Abrams tank. Mobility such as being able to fire on the move is also key. This was the Republican Guards down fall in the Gulf War in the tank battles that ensued having to stop and fire got a lot of them destroyed by the quicker and more mobile M1. Speed and mobility are key.
I believe has long as developing countries such as the US, Britain and others continue to make advancements in technology it will carry over to the tank and other military warfare equipment.
Ture however, making tanks a bit faster means less protection. There is no way to do it other than that. I think battlefields of the future are going to deepened on more LAVs with mounted anti tank missiles. If such thing were to be adopted then tanks would more vulnerable and useless. Its true that Tanks armament can take out LAVs easily but here comes the C-4 strategy and air supports.