What will you sell instead?
Ill sell anything the client will buy thats not Wordpress. Wordpress is the only thing clients have heard of, they know they can edit the site themselves and can take it to another developer if they want, no lock in. I used to try and sell the client on Joomla but the plugin subscription model was hard for the client to stomach, a subscription makes it look like a service then they get scared of lock in.
Since I ditched Joomla three years ago for perch its been great. They are worried it will be difficult to edit, I show them the backend of another clients website and they say "WOW thats a lot easier than Wordpress!". They are worried about lock in, I tell them its a one time price for an open source professional cms that they can then take to any developer and they are sold.
I will still try and sell my clients on perch, as I think its the best option for them but if I fail they get what they want (most likely wordpress) and you don't get paid. I apologise if my tone comes across as critical, I'm fine with the new model, I am just trying to pass on my clients concerns as ultimately they are the ones paying for perch and making the decision to use it, not me.