Maybe this is too personal for an answer, but I think that if a person asks that question, then the obvious answer is no. If you aren't absolutely driven to do it, then it probably isn't what you really want. If you are just "looking for a nice career" then you aren't driven enough.
But if you are absolutely driven by the need to understand "stuff" at a deep level, then maybe it is for you. This implies that you are willing to sacrifice other things (hopefully not other people, though) in the need to achieve that understanding - even of things not yet known. The particular "stuff" isn't nearly as important as the burning need to dig into it.
Another deep driver might be a massive unrequited desire to teach at some level above secondary. Even undergraduate faculty basically require a doctorate, even when serious research is but a small part of the requirements.
Academics and other researchers can achieve a comfortable life style. But the rewards of a doctorate are mostly internal. If the drivers in your life aren't like that, then it will be hard to make it work.
So, for the question itself, ask them what their drivers are. What do they want to achieve? What would make them happy in ten years about both the future and the previous ten years?
If they ask you "Should I..." then maybe not. But if they ask "How can I...", then you have something to work with.
I was driven. I stumbled once, which brought the future into doubt. The intense desire was enough to push me through, even though my family might have wished me to change direction. It wasn't an option. Luckily I found some allies and supporters who helped me get going again.