The truth is, there will be wage increase only if there is demand for the retrained skilled workers. If cheap foreign skilled labour continues to be readily available, wages will remain low, according to the standard set by the foreign labour.
Take for example. Restaurant service staff. Are they skilled or non skilled? To me, i think it depends on how they dish out their service. Its a job nobody wants. Even if the boss is willing to pay more for a waiter than office clerks. Most people would rather work as office clerks. Because the environment is better. They can use their mobile phones to chat when they work in office. They are considered as white collar worker, hence have more self esteem. The waiter will always be looked upon as low end job, low pay (even if it might not be true), always busy (may not be true as well), most importantly, most parents would not allow their kids to work as waiters, but ok to work as office clerks, because of their face. Sad but true facts of all developed nation and metropolitan city.