Crawler undercarriage wear is a system. Remaining life cannot be judged reliably from track-pad appearance alone.
Measure components
Links, bushings, sprockets, rollers and idlers need measurements against service limits.
Look for patterns
Uneven wear can indicate alignment, tension, operating-practice or component-mixing problems.
Review environment
Rock, sand, mud, travel distance and slope materially affect wear.
Price the system
Use a professional report and local parts/labour estimate before assigning a repair reserve.