Never give up unlimited unless you have to. Not like the internet will suddenly stop using more bandwidth. The bigger files are, and the more the world runs on the cloud, the more data you'll need to use.
Maybe they'll actually offer unlimited data again (lol), until then, keep it as long as you can. That's my advice.
I had some of that logic for years. Kept paying extra for unlimited. Paid for service on Ipad(s). Paid for service in some hotels. All for what? Some unreasonable fear of giving it up.
Finally switched. Saving $1000 to $1,500 a year. Stupid me for holding out for so long.