Reading current scripts is preferred, but there is something to be learned from every script. Bad scripts will show you what to avoid. Good scripts will show you what to aspire to.
If you’re writing for TV, you need two current pilots (meaning they would work on TV now, not three or more years ago) and a current spec. You should also have three to five ideas ready to pitch at any time.
If that sounds like a high bar, it is. Aspiring screenwriters need to show that they are dedicated, that they take their craft seriously, and that they’re in this business for the long haul.
It was said several times over the weekend by several smart people: A career in screenwriting is a marathon, not a sprint. You simply can’t expect to write one script, sell it for six figures, and move on.