MrWingNut. From the little you describe of your position I would personally recommend to keep your current job and use the money to fly GA as a hobby which, in my opinion, is much more fun. See how much money you would lose in loss of earnings / 'enormous loan' in the years until you get your command and can match you current salary (that is if you have the aptitude for command in the end).. think about how much amazing GA flying that could buy.
Jamesgrainge. I think you have to cut commercial pilots who have become jaded some slack. I suspect the kind of personality that pushes themselves to become a pilot be it PPL or ATPL always looks for new challenges in life. I used to see it in PPLs who would rapidly give up flying after taking their friends/families for a few local flights. Once you have achieved whatever you wanted to for many it becomes boring. Airline flying is very regimented and rightly offers little room for 'having a bit of fun' thus not particularly interesting after a fairly short period of time. I see many disinterested senior FOs awaiting command who have run out of challenges. Add onto this constant exams and airlines regularly in crisis/job uncertainty you can perhaps see why people are sometimes hesitant to recommend it to someone with a high paying, secure, enjoyable career.
Good luck with whatever you choose.