Wizards wouldn't be in any problems from a lack of new spells. You'll note they know just as many as a Sorcerer at almost all spell levels, get them sooner, and if they're focused specialists, have just as many slots. And with a 1 level dip into master specialist, they get skill focus(spellcraft).
By level 5, they'll have 8 ranks, +3 from skill focus, +4 from int(conservative), +2 from MWK tool, and +1 from a min die roll.
That's 8+3+4+2+1 = 18. That's enough to learn level 3 spells at level 5, when they become available, without doing anything more excessive than jumping into a common prestige class and buying a 50gp Mwk tool. And that's not counting the +4 worth of synergies, +2 from specialist school, or anything else you could do to optimize the check.