PreSeason Rune Changed - Base Damage

I have some slight concerns with the new runes/masteries. Normally I take a run page that gives me some base armor scaling MR and about 15 AD. With the new changes I will no longer have the option to take the extra AD. So I will now have to relearn how to last hit on almost every champ.

I'm not a very good player, I like to play with friends mess around and generally have a good time playing the game. I have for years and plan to cont. for years to come. Due to the skill level and play styles of my fellows, I normally play the ADC role.

My question is, will there be any transparent nerfs/buffs to minions/base AD for all champs? Or is it going to break down to git gud status.