Yes. We went 2 weeks without any and it's heaps better now as we are back to only very occasional viewing (with minimal tanties in between) and DS has returned to being about to happily occupy himself all day.

I recommend going cold turkey. Just turn it off - it'll be really hard for the first couple of days. I suggest planning lots of outings. Just don't go near the tv (sit somewhere else) and prepare yourself to ride out the whinging and carrying on. It will go away as he learns to get on without tv again.

They get addicted - there's a great blog about it on Janet lansbury's page.

ETA - I don't think it matters *what* you watch, or even if you switch to other sorts of screens (ipads, etc). The result is the same. My friend has exactyl the same problem and has found that zero screen time is the only way to go.