So far, I haven't seen a problem with it (possibly because my INT is high to begin with), but the skill points are not a problem for a wizard. For one thing, as long as he has 4 skill points, he can get Concentration, Know(Arcana), Spellcraft, and Scry, and that's the basics he needs as an effective wizard. Other Knowledge skills are just gravy. All he needs is to siphon off about 2 skill points every 4 levels from different skills to spend on an occasional additional language, and he's ready to go. However, I STILL wouldn't try this with an INT of less than 14, because you then run into SERIOUS problems with losing levels of spells for two or three class levels at a time.
I have a mindset that no character HAS to have maxed out skill ranks - it's helpful, but a character can be two or three ranks behind and still be effective, leaving room for a few side-line skills.
As my point earlier, I find it more beneficial to have a higher Fort save and double my hit points than the extra skill points of a higher INT.