Will GPT-3 change the Front end developer eco-system

First of all, as per Betteridge's law of headlines the answer is No. Not GPT-3, anyway, it hasn't been trained to be performant in coding.

But I am sure future language models will give developers lots of new projects to work on. Automate all sorts of office tasks, build a research bot, a teaching bot, counselling bot, writing aid bot, coding bot, natural interface to knowledge bases, automated information extraction from all sorts of unstructured and semi-structured documents, news monitoring and digest, emotional support chat bots, NPC game bots, math problem solving, etc.

And it's not just about better prompting, we need to improve the training set to include more examples of the desired tasks, monitor it for bias and profanity, measure its performance, integrating it in all sorts of places.