Realistically there is no way the teams are going to agree on any meaningful changes to the boats and short of swapping out AC72s for F18s there is little that can be done to make the boats truly safer (keep in mind there have been a number of people killed under the tramps of beach cats over the years). What can be changed however is the course so lets look at it from start to finish.
Leg one. The entire first leg is pretty much in the "death zone" and is the time where the two boats are most likely to be pushing hard. Add AC level pressure and problems can occur.....
First mark. The bear away is the problem, putting it 1 minute into the race means that it will be done at speed as you won't want the other boat to get the jump on you.
Downwind legs. Second only to the bearaway in risk is the Gybe. The narrow course boundaries and high speeds mean that teams won't really have a choice of timing or when to gybe (can't wait out a gust)
Course length. having lots of short windward returns increases the number of times the team has to go around the top mark and survive the bear away.
Last leg. Another leg in the "death zone", less of an issue because the likelihood of the two boats being together is much lower so teams will be able to take this leg easier.
So if they want to make the race safer we should be having:
1. A traditional upwind start keeping the boats out of the "death zone" for a few minutes and relieving some pressure at the top mark.
2. Wider courses (or loose the arbitrary boundaries) allowing teams to pick and/or minimise their gybes.
3. Longer legs reducing the number of times the boats have to round the top mark.
4. Upwind finish (one less bearaway).