3000 hours TT might be a little too high, something like 1000 TT benchmark is more achievable. One must remember that most instructor jobs are seen as a stepping ladder in the industry. I agree that a 250 hours TT instructor does not have the ability to impart serious experience onto a newbie.
So far, the CASA system (OZ) is the only one asking for a higher minimum TT hours before an IR can be issued. I have flown with so called experienced pilots trained by other countries, and I will trust an Aussie before any others. (1500 hours below)
I had the privilege to fly with IR's with 5000 + hours TT to 15000+ hours TT and believe me EXPERIENCE counts...
