@Joe *********
nope, when your work permit <- which is a requirement of you HAVING the extension you're on is cancelled then you have to go to the immigration office and cancel the extension AND you'll get fined for every day after the work permit was cancelled that you didn't have the extension cancelled
BUT
Seeing as you're getting a DTV (which is employment prohibited) <- meaning you can't work IN thailand for a thai entity, you're fine doing nothing,
Just go get the 5 year DTV, come back in and get the 180 day entry on it