Even if the same standard was adopted, the advances in alloys and composites have made the bats livlier. The only real solutions would be a limitation on the f.p.s. off the bat, similar to golf club regs. Another novel solution would be going back to wood.
I play baseball in an adult wood bat league. All bats have to meet BESR specs. Some these days are made of bamboo and composite wood. Unlike maple bats, they don't shatter when the break, if they break at all. I have had one for 4 years and use it often in batting cages. Not a crack in it, yet.
The only reason the pitcher's parents are suiing Easton is due to the deep pockets of the company.
ASA does and it's currently 98mph with talk of lowering it to 95. All bats must also meet a standard called the BPF which stands for "Bat Performance Formula" and the current figure is 1.20. A brief explanation: The ball can not accelerate off the bat more than 20% faster than the contact speed generated by the swung bat.........or something like that.