It's actually getting pretty difficult to buy a new "dumb" TV these days. The last TV I bought was in November 2014, it's a normal 50" Plasma screen TV with zero connected features. Some of my relatives liked the TV and asked me to find them one like it and I can't. Apparently TV makers have decided that making good TVs isn't important and packing them with smart features I don't want or need is the way to go.
That's the key point. Your TV is fine because it's old. New ones are built with planned and unplanned obsolescence (unplanned is when your "smart" TV loses half of its functionality because some service goes off-line or even changes their URL or something).
Video and Films are my business and my TV is a nearly 5 year old LG plasma that still performs great. And I only bought it because my ex kept the Panasonic plasma after the break-up or I'd probably be using an 8 year old TV.
Are there any reports of smart TVs not working completely (inputs stop working) because the "smart" connected features stop working?
For the record, mine is close to 18 years old and continues to work just fine for watching broadcast television. Yes it's fatter than those newfangled flat things, but it doesn't watch me watching it, it doesn't record my conversations, and it doesn't report my viewing habits back to the mother ship. One day it will fail and I'll be forced to get a new one.