I think its a tough call. Bale is a loan, assume zero fee, but £10m say in wages
If we sign a younger guy, say 21-24 years old, we might spend £30m on the fee plus say £5m in wages. However this guy has a re-sale value
Even if only say half that fee is paid up-front, we have a higher outlay in year 1 for the younger guy, when cash is tight.
Bale's impact has been up and down, and people will target his lack of back-tracking, so we'd need to have to work out how to cover it
also obviously need to see whether the new guy plays with wingers. A 3-at-the-back manager wouldnt have the need for Bale