I put your questions to Valerie Edwards, an employment lawyer and partner with the Toronto firm Torkin, Manes, Cohen and Arbus. In the human resources issues you've raised, employers hold most of the cards, she tells me, especially in non-unionized organizations. Employers can change the requirements of a job, Edwards says. Employers can also downsize staff or fire those who don't seem able to adapt to change. As a general proposition, an employee can be terminated as long as the employer gives reasonable notice, or severance in lieu of notice.
Many employers do offer training.
It is much less expensive to train existing employees than to incur the extraordinary costs of high employee turnover. While it's impossible to fully protect yourself in a rapidly changing world of work, the more versatile and adaptable you are, the more skills you have, the greater your own security. You may be wise to take a weekend or continuing education course in marketing. Seek this out yourself. Ultimately, upgrading your skills is your responsibility.