I've done oil analysis on all my vehicles for years. You will typically see wear metals in the early changes, but they taper off after awhile and those are the "golden miles" when your engine is running at its best. Once those wear metals make their return, it's probably time to sell 'er off and get another one. That said it may be 100,000 more miles before the engine requires major work, but why take chances unless you don't drive many miles.
It my experience, wear metals aren't usually the tell tale sign as much as oil dilution from ring failure. That's nasty, and it's time to divest yourself of that vehicle or save up for a repair.