BOH-GVA Year round
I've been a regular user of this route, and will again this year, not once for skiing though! In my case its work.
But what you see when you use the BOH - GVA flight is consistent good loads and yes of course skiers, but much more than I would have expected of VFR traffic... all those wrinklies that are reputed to live in the BOH catchment have friends and relatives in Switzerland that they visit and who in turn also travel to BOH to visit Granny.
The consistent message from pax is that its so much easier than Gatwick or LHR, and god forbid Luton or Bristol (due nightmare road journeys).
The Air Berlin experience was very similar re VFR from BOH for Germany.
I agree with Ryanair 1, there is scope for a year round GVA, though perhaps at reduced freq.
FF