Go for it, thats what I say!
My mum, as great as she is, said I should get a job in a bank or something in the late 1980's, and look how many jobs have gone in that sector since then!
My dad was supportive, and I embarked on a ppl in '93, and self financed my way through the ratings and secured my first flying job in 1998 on the BAe146. Remember, times were pretty bad when I started out in 1992/1993 and picked up through the 1990's.
I am now a Captain, aged 33, on the Airbus and firmly believe the investment and hard work to get to where I am today has paid off. You only get one shot at life, and if you are going to spend 40 years at work, you had better do something you like!
Yes, times are going to be hard, but people will continue to fly and people always retire, there could be less people entering the market because terms and conditions are not what they were and will go into the city etc to earn their money.
As someone else stated, once you started out instructing, moving on the flying single pilot twins, the turboprops then once you had built up considerable experience moved onto jets. Now I have colleagues who finished flying training in 2003, moved onto the airbus in 2003/04 and have just got commands on the airbus!!! Things change, they always do, but if you really want to fly, then do it!