I like the idea of bracelets. Just the fact that they exist may be enough to deter
some of the non-resort/non-
dvc guests from crashing a resort pool. I also agree that the bracelets will only solve part of the problem. The question remains about what to do with DVC members who are at a pool which has just reached capacity and is now closed to pool hopping.
In my opinion, the problem isn't as much leaving the pool as it is
being asked to leave. There's a definate humiliation factor in having a CM approach your group and being asked to leave. I can hear my mother saying 'it doesn't matter what other people think' but frankly it would bother me tremendously that other people around the pool thought we were pool-crashers who got caught rather than DVC members there legally. Many of these people probably don't even know what DVC means, nevermind that pool-hopping is a legitimate benefit.
If there was a way for CMs to let DVC members know that pool-hopping restrictions are going into effect I think alot of us would leave a resort pool voluntarily. For instance, (I know - very elementary school-ish, but it's the best I can come up with) if a CM passed out a sheet of paper that said something like,
'We apologize for the inconvenience, but the [insert resort here]
Pool has recently reached capacity. We are suspending DVC pool-hopping priveleges for the remainder of the day. We ask your cooperation in exiting the pool area at your earliest convenience.'
With the exception of the cost of the paper, and the manpower required to hand it out, this seems like a no-brainer for Disney and a total win-win situation for both sides. I don't know about you, but I wouldn't be embarressed to get up and leave after receiving such a notice. First, I'm a DVC member and proud of 'owning a little piece of the magic'.

Second, all of the other people around the pool will know that my family and I weren't crashers, that we were there legally. Disney wins in that all of the pool-goers are now asking about this 'DVC' thing. And saying, 'wow, they get to swim at any pool they want!' These same guests can also take comfort in knowing that Disney is aware of the crowded pool area and doing their best to accommodate the guests staying at that particular resort.
I admit the 'passing out a piece of paper thing' sounds cheesy but with a little effort and imagination it could easily be a laminated mickey-shaped notecard with a generic message (no dates) that can be used again and again.
In the meantime, we haven't pool-hopped yet and aren't too eager to start. Although it wouldn't make or break my Disney/DVC experience I would be very embarressed to be approached and asked to leave an area without some explanation given to the surrounding guests.
<font face="Class Garmnd BT"><font color="ff69b4"><big>Jennybúoú benny</big></font>
<font color="9400d3">~~DVC Member~~
Onsite: Poly '76, Contemp '98, BWV '99, CBR '00, BWV '00, CBR '01
Offsite: '74 '80 '82 '88
Next trip: BWV~June '01, ASM/BWV~Nov '01</font>
Jillian & Kyle's Disney Character Website</font