Well no, jobs already have 5 more skills, and 5 tiers more (5x5=25 + 50 = 75) you'll have in total 10 abilities more and anything a class learns the job gets too, so in a sense as long as the leveling continues the gap between a job and a class will get bigger.
as for cross class abilities (which I rather not count since we should just a class by its own merit not by what it borrows from others) sure you'll probably have access to more though I think with the limitation of 30 skills on the action bar you'll eventually hit a roof and it'll be more about the quality of skills, and I think jobs will come on top in that category.
The only thing classes have over jobs in solo/low man situations is access to cure and Stoneskin, (the entire classes are for soloing argument is based around that some jobs can't heal, while classes can borrow cure and stoneskin from CNJ. ask yourself this: if more jobs had a curative skill would you use classes over them for soloing?) but in cases like PLD, WAR and WHM jobs do have access to curative abilities and always performed better, a PLD will outlast and probably out DD GLA with Holy Succor, Divine Veil and Spirits Within. WAR I need not explain since they needed to rebalance them to stop them from being the overloads of solo tanking and DDing and WHM has been proven to be able to dish out damage and stay alive in many situations. (Also BRD can DD and cure, and keep himself refreshed)
As for having more skills, the fact is PLD will out tank GLA and DRK will out DD GLA, so its stuck in a middle (I want to play alone) ground, since nobody wants a mediocre DD or a mediocre tank over a proper one in any PT situation and the fact that as levels go up jobs just get better at their roles while classes stay the same. (CNJ will never out heal WHM because WHM is a CNJ built for healing) which brings us back to the play solo argument, in which I have to say...
Interchangeable Subjobs! go WAR/WHM! the world is yours!
And yes I'm aware the chances of Yoshi and the team being enlightened by my wisdom are very very slim( this slim | ), but that never stopped Barney Stinson from preaching the Bro Code, nor will it stop me.