Remathilis
Legend
I really hate quoting myself, but since this is the same argument over again...
Short answer: No.
Long answer: Only if you want poor-man's versions of each class. A druid isn't just a cleric with a wolfie-pal. He has unique armor, weapons, spell lists, powers, restrictions, and outlook. A ranger is more than a dual-wielder with survival as a skill; he is a tracker, ambusher, skirmisher, survivalist, and part-time druid (who is not a nature cleric). You can't begin to fit "monk" or "bard" into four feats over nine levels (unless your point is to reduce them to shadows of their former power) and that doesn't EVEN begin to address alternate methods of doing the same thing (sorcerer spontaneous casting vs. wizard vancian vs. warlock at-will).
Further, it robs me of the ability to multi-class or the ability to customize my own class (to make a paladin with the slayer specialty or a magic-user/druid), and if I turn off backgrounds and themes, I lose access to all classes but the core four again.
No Thank You. Assassin, Barbarian, Bard, Cleric, Druid, Fighter, Monk, Paladin, Ranger, Rogue, Sorcerer, Warlock, Warlord, & Wizard in the PHB.