I had heard that they have to remove the curfew in July, around the same time that they implemented it last year. The reason being that the curfew is not actual law, but a presidential decree, and they can only last one year, unless it is made law. this is what I had heard anyways, it's worth looking into.
As for the curfew, I disagree with the way it was implemented. It was a drastic measure designed to achieve quick gains, but could have long term consequences, both for tourism, and have social implications. 12 is way to early for a weeknight. If you work 9-5, or 9-6, by the time you get home it's 7, eat, shower, get ready, and wait for the women, its 10, get to the bar its 10:30, almost makes it not worth it. The other factor is that not everyone has their weekend on sat-sun, why shouldnt they be allowed to party on weeknights. It wasn't clearly thought out. If you take a look at england, they are implementing 24 hour licensing because of the anti social behaviour associated with an early last call - decrease the time people have to drink, they will drink more in a shorter time, leading to more drunk people.
Ideally the way this should have gone down is as follows: Colmados close at 12, they are located in residential areas and it's not fair to have them blasting their music at any hour. If people want to drink cheap booze, they can pick up a bottle at the colmado before midnight, and take it home with them.
Bars should be able to stay open at least until 2am on weekdays, 4am weekends, perhaps even allowing special permits for places to go on afterhours, provided they are not within residencial areas.
The implementation of the cindarella decree is practically the only aspect of law in the DR that you can see constantly enforced, I don't think they would have a problem enforcing only bars to stay open later. As mentioned there are a lot of people who go on vacation in places expecting to party till sunrise, not being able to will leave a sour taste in their mouths, and cause bad publicity for the country.