Gear driven oil pump?

I have a early 2005 Jetta TDI. About 250k miles. I purchased it with 160k. I was just looking through Craigslist for another TDI for my wife to replace her commuter. I read something about chain driven oil pump and if it fails it will total the engine and that a gear driven pump is what it should have. My question is this something I should be concerned about? I have a lot of money in my TDI and completely fix what ever is needed with theory that it is getting progressively newer if that makes sense. Should I have my oil pump changed to a gear driven unit?

Repair history for background: timing belt, cam and followers, clutch assembly, egr block.

Fuel economy: 46 to 49.5 mpg consistently.

Thanks

Gear driven oil pump?