What do you mean by 'all sectors'? With respect to whether a PhD is right for you, I'd recommend Google and also a bit of self-reflection. Do you like studying? Are or can you be a highly motivated individual? What particular interest would you like to research. And as much as I hate the vacuous idiot, as Paris Hilton says, 'do you love it?' So I think that only you can decide if it is right for you. I suppose you could search this forum for tales of PhD woes and glee.