Re: IT skills are fungible
> "Make it unattractive to employ you and companies will find more attractive options."
Agreed. Whilst unions may have started out with laudable goals and were useful 50 years ago when there were few employers in town and workers had little choice and fewer options, that's not the case any more for many industries, IT especially.
Any form of protectionist interference in a labour market (which is what the unions exist for) is anti-competitive, anti-business, and ultimately anti-worker. Why do you think China has become the factory of the world with a positive balance of payments of around a $Trillion (with a T!) every year? Lower regulation / less red tape, it's as simple as that.
Unionisation is short term gain for long term pain, as evidenced by this story.
If you don't like your working environment / conditions / pay, then either make yourself indispensable and renegotiate from a position of power, or vote with your feet and leave, retraining / up-skilling as you go if necessary.
Unionisation will not only work against you in the long term, but it's a lazy move, abdicating your individual bargaining power to someone else, hoping they negotiate in good faith on your behalf.