By the way, you have to think at the company which work arround Elastix (like IT'TEK) and makes some Elastix Addons.
For your information, at the end of this years (for my birthday) I would be unemployed. I counted on this oportunity for creating a job at home making some Elastix addon.
Next, i don't talking about the cost for each migrating, so for each client.
Some of them could be too expensive. (Licenses and the time to learn 3CX... yes i say 3CX because it's 3CX, and not Elastix).
I don't talking about the difference between both dialplan. You know like me that the client hate this kind of stuff (change the manner to work).