In reply to Graham Armfield.

Since nearly everyone will likely be in the same boat if v5 launches without proper metabox support, it could be an opportunity for an maintenance upsell. It won't matter whether they're a charity, non-profit, etc or not. WP.Org will have made the choice for everyone which while not very democratic is the way things are heading lately.

Anyone in the industry that they go to (even if they don't necessarily come back / choose to work with you again) will then have the choice to eat the cost of the work performed (in return for example, a maintenance contract) or a simple quote of the job cost.

They'll also have the option to leave the WordPress platform, etc if the scope of the work is comparable than what it might cost to redo the site another way or with another platform.