Is "Have nice holidays!" correct? I wonder if you say as mentioned above when "holiday" is plural.

Correct my English, please (The following is the opinion about development of technology.) It is said that the development of technologies might deprive people of their jobs. But I don't think it connects lessening the business field of people. First, there are many services that require human communication. We, human beings, can be relieved by smiling, very characteristic action of human. Second, we need the workers who watch, control or maintain the technologies. The more technologies are used, the more people have to work with them. Finally, the improvement of technologies might give us extra time to consider their business, which might produce new projects, products or services. As a result, these new things would give people new kinds of jobs.