I believe those agencies that create the "so called cheap websites" will utilize such AI based tools to create better websites, faster, and more cost effective for their customers.
Given a talk like -
Agency: What is your budget?
Client: 500$
Agency (yesterday): I can only do so much
Agency (today): I can offer you more for the same budget
The agencies that churned out cheap websites based on templates are the ones that will be impacted.