If you do the so-called "150 hour" course and come out with 70 in command then yes you may well find that is not enough for some insurance companies. But it doesn't sound like your flying school told you that or, it seems, gave you any kind of realistic career expectations!
What's the point of doing a course that was designed for airline cadets who already have a career mapped out when you are trying to get into GA?
If you do the so-called "200 hour" course then you will come out with more like 130 in command and much more industry ready- and insurable-to get on the first rung of the ladder.
And as for being an instructor, it's high time CASA had some kind of pre-entry requirements to actually be able to fly and teach rather than the only barrier to enrty being the credit card limit and a desire to "fill up the log book".
