How big a factor should repairability of discontinued gear be in your purchasing decisions?  In my experience, not at all.
   The issue of Canon (supposedly) no longer repairing some prior versions of their top-grade “L” lenses came up on Facebook this week.  But my experience says not to worry about that - but to buy the earlier version used at a big discount if it’s reportedly fine with pro users.
   I’ve had three 7D bodies - plus 24-105 f/4 “L” IS USM, a 24-70 f/2.8 “L” USM, and a 70-200 f/2.8 “L” IS USM lenses.  I’ve also had a G15 and prior G-series digicams as backups for the dSLR gear.  And none ever needed service of any kind.
   Of course, the dSLR bodies and particular lenses being weather-sealed was a big help; I shot stories in driving rain with all.  But that G15 also got plenty of use - and bounced around everywhere with me, but always was good to go.
   Back in the film era, I had a Minolta rangefinder and my mother a Konica SLR; neither ever needed any repairs.  Even that knockaround Instamatic I started with didn’t need repairs.
   Buy good gear, take good care of it - and you’ll be fine.

This G15 bounced around everywhere with me - just fine.