Yes there will always be demand for coders, but will there be enough demand for the current (increasing) supply? Right now the global number of software developers is growing by about a million per year (total is only 28.7 million) - this means that (very roughly) to keep salaries stable we also need demand for new software to be growing by about 3.5% per year. I know that doesn't sound like a lot, but a decade from now you'll need 1.4 jobs for every job now to keep up with the supply.

In the past we had new dynamics to get end-users to spend more and more time using computers and hence software (desktop PCs, video games, internet, mobile phones, social media, etc.). At this point there's so little time left in a consumer's day that tech can grow into that I worry that any further advancements will have to cannibalize from another area; I.e. we've reached peak demand for software.