I don't know, if you post a link as well as an image you're losing 24 characters from a 140 character limit. You lose just less than 20% of the characters available. I think a 20% increase is fairly substantial.
Especially considering most changes are pandering to brands, and this is a use case that we use a lot. (Whether Twitter is a useful channel aside...) extra space for copy will always go down well with the people paying the bills.
