Last month we were hired to bring a website from 2011 up to date with current version of WP.

The site was running WP 3.8 (current 4.8.1) and WPML 2.3.4 (current 3.7.1).

Think it was possible to simply update the lot?

Of course not! Why else would they hire someone to do it for them?

The ONLY way to update a site like that is by using incremental updates.

Is Jorbin planning on doing these updates incremental?
Didn't think so!