whats next, Levis suing every company that make 5 pocket jeans?
They're not as blessed as Nike is with the fact that the slang term for their product ("chucks") clearly refers to the Nike-owned product "Chuck Taylor All Star". You can't actually sue on design, so Levi's couldn't actually sue for a competitor making a five pocket jean. If we lived in a different world where "Levis" was slang for any denim pant, then yes, they actually could.
This is probably why Nike (i'm not talking Nike SB... i'm talking Nike the whole thing) saw Converse as a desirable brand in the first place.