JES:
These are very difficult - and very valid - questions.
My feeling is there will be a honeymoon period where every Joe Q. Hack will want a bushnell, and Joe Q. Rich will want a GPS device, and they will proudly show them off for their friends and overuse the crap out of them. But as devoted to new toys as he might be, each of these Joe Qs are not stupid. He'll see the tiny if any benefit they give, the pain they are to use, and they''ll go into his bag with the ball retriever, to be used with about as much frequency.
So "this is gonna cause slow play" arguments to me have a bit of chicken little to them. Oh, such might occur in the short-term. But in the long term we'll be fine and it may well even decrease time of play as those devoted to the devices learn better when to use them, and HOW to use them.
As for the rest, well... golf has never been very good at holding back technology, and to me it's debatable whether we should even try. Oh sure, we have to keep a reign on things somewhat - but of course the counterargument to all of this is why aren't you still using hickories and featheries?
This was all argued before. Many here have the take that while going back to hickories and featheries is an extreme even they won't go to, they do want technology reined in better. They don't like any allowance of these distance-help devices because they find it an affront to the game and another path on the slippery slope to all skill being taken from the game.
I am sympathetic to that argument. I just don't buy it, as it pertains to these devices. Because to me, they still don't help one hit the golf shot. And with courses as well marked as they are, all skill in estimating distance has been rendered pretty moot. Perhaps I'd think differently if I were a UK golfer where markings aren't as common... but Rich Goodale tells me bushnells and the like are all the rage over there, also.
It seems the genie is out of the bottle when it comes to getting distances correct and accurate - on both sides of the atlantic. It's not going back in.
And that being the case, well to me the local rule seems a fair compromise.
You'll notice again I didn't adress the legal issues. Such may well be driving this. But for one I don't think bushnell or any GPS company has that kind of clout... not like the equipment makers anyway... and for another, I just do think the other reasons here and practicality carry far more weight.
TH