SEO is nowadays becoming a vital process for earning money online and its a very good process for improving your site. So people are showing their keen interest in it. Thus those who want to make money and want to make career in this filed then its very lucrative for them. On the contrary some people feel that this is just a short way to earn for a while. In the past there was no any way to earn online. But nowadays internet is avilable and many sources are coming online for making money. Let them take the decision to make a career in SEO or not but overall its a good field to go ahead.
I agree with him... If you consider more on Internet Marketing as whole, then there are more likely to chances of survival in this internet industry, I'll focus on web analytics, seo, Affiliate and sem..