Shea, what's the argument for why youth caddies would be ok, but not adult caddies? Is it just the idea that resort and public programs might not survive much longer, while private clubs with Evans Scholar programs may continue to support theirs?
Regardless, I would expect that overall caddie numbers decline. Youth caddies may become a higher percentage, but mostly by attrition of adult caddies - not replacing them.
One last thought on the handshake thing. The handshake on the first tee is one I could really see being dead - I'm usually 4 hours from washing my hands again when I'm standing on the first tee. As a borderline-compulsive hand washer, I generally beeline for the sink after a round of golf. A handshake on the 18th green doesn't scare me much, as I'm heading to wash my hands pretty much immediately after anyways. You know... assuming the clubhouse eventually reopens.
High fives and knuckle bumps after small victories in the course of the round... I don't know what happens to those. I made a lot of pitch-in birdies recently while my club was counting any ball that bounced off the raised cup liner as holed. I missed getting dapped up, but half of those balls probably wouldn't have gone in under normal circumstances so it's a small price to pay for being able to say that I've now birdied our 480 yard opening par 4.
Honestly, I suspect most things will come back in due time, including bunker rakes, ballwashers, seed/sand mix in bottles and bins on tees, water coolers, and two-to-a-cart. Pulling the flagstick may truly be dead in most situations.
I wonder more about what NEW things get added. Are we going to see hand sanitizer/washing stations on the course? Will the single person cart/golfboard really take off? Is walking golf going to have a renaissance in the US, or will the proliferation of the golfboard make walking completely obsolete?