While I am also of the opinion that anybody should surely consider the drawbacks of any decision before making it, this just smells fishy...
If you're a legitimate BA pilot, please consider the next few sentences as unspoken.
However, to me, it seems strange that somebody would only sign up here to make a demeaning post about a very desirable cadetship, and the airline that backs it.
If anything, it almost seems like the post is intended to try and discourage some readers to even join the selections. Which could be favorable to the poster, if he has the intention to join the cadetship himself.
To be fair, I know quite a few "old and grey guys" who still absolutely adore flying. Even they would jump at a cadetship like this, were it not that they're all just a tad bit too old.
In short,
If you're truly a BA pilot: thanks for the other side of the coin.
If you're not... I feel very sad for you.