You could make 5 or 6 good default base playbook like my post suggested.
Think spread option, power run, run n shoot / air raid, pistol ect on offense and the same generic ones on defense. Think zone / zone blitz defense, multple man defense, all 4 down line man or all with 5 dbs a true multiple defense. the key being you could remove the useless 7 and 8 man blitzes and add more logical base plays the cpu can be more successful with.
you could assign the same playbook to 10 or 20 teams. you are not limited to use a playbook only once.
In ncaa 11 in dynasty we went through and took out the spread option teams playboooks since they didnt run them well and gave them all wisc, or mich st, or another run heavy base option playbook.
With 40 formations, that is twice as many formations as the current playbook so diversity would still be better than what was in ncaa 11.
On a side note i guess it has not been determined if you could load these multiple times per dynasty team. I dont see why not. its one file u use multiple times like a teambuilder team in conf play after the user retires.
You use an alternate profile and assign each team with the improved base playbooks then go in and switch teams and change the next team until you retire that profile. when you leave the playbook and coach settings stay.