Very difficult issue.

This sort of thing is happening everyday in the west, except instead of relocating to another cheaper province, the factories are locating to cheaper countries.

Its called globalisation.
Globalisation means each country now has to find fields/products where they have a natural advantage, instead of trying to artificially support those industries where other countries can do it better.

There's a trade off between having cheaper products available, and keeping local jobs - its now very difficult to achieve both.

I acknowledge its affects can be devastating to some workers, but also note that opportunities are provided elsewhere for people who might not have had a chance otherwise.

My biggest concern is that environmental & safety standards are upheld, and apart from that the labour cost will reach its natural level over time.

Of course progressive taxes are also needed to play a part in 'levelling' the outcomes, otherwise the only real winners will be the 'exploiters'

Sorry for such a simple analysis, but although I have an economics degree, I am certainly no economist:)