No, no, and maybe. Alignment restrictions might make sense in some cases. Race restrictions are okay for a campaign world but not for the general rules. Ability score restrictions, especially in environment where the scores are rolled, are just bad design. Either you roll poorly and don't get to play what you want, or you badger the DM into letting you re-roll until you get what you want, or the DM just forgoes the rolling and gives you what you want so that you won't be badgering him or her. 3e/4e had the right idea in having classes give a benefit for a high score in X without requiring it.One of the things that always intrigued me in the older versions of D&D was how race and/or ability scores disqualified a character from certain classes. In order to be a paladin, one originally had to have a CHA of 17 or more, be human and lawful good alignment. A ranger had to be human (and later elf or half elf) and have a boatload of good scores. Even if the game allowed other classes to be paladins or rangers, ability scores still played a factor. A dwarf or half-orc is typically uncharismatic and so would likely never make paladin. Elves would not usually have a high enough CON to be rangers. Yada yada..
I know that 3.x eased up most of these kind of restrictions, and 4e basically through them all out. Since we are talking about reincorporating old-school concepts, should class restrictions be among them? If so, which ones?

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.