The pros are much more space for much less money. You will likely save $1,000 or more vs. renting points. You will get a 2BR with a full kitchen and a washer and dryer.
The cons would be having to pay for transportation if you don't have a car. Also, you can walk to Disney Springs from SSR, which is nice if you plan to go there for a few meals.
WBC has a rather limited shuttle that I recall is $7 per person including kids, so $21 for a round trip in your case. If you decide to go to the parks in the AM, return to the resort in the afternoon, and go back in the evening it would be $42, so it can add up. The times the shuttle leave may not fit your rope-dropping plans as well.
If you are going when Magical Express is still free, you also have the cost of transport from the airport to the resort.
Many people who stay at WBC report using rideshare to go to the parks. With rideshare, you can pick when you want to go and the cost would likely be similar to the shuttle.
As far as I know, there is no service to Universal, however, companies like Mears provide shuttles that can take you there. Or you could just use ridesharing.
Overall, I recommend anyone staying at WBC to rent a car in they can. In the end, having a car can save you money by easily heading off-site to a grocery store for snacks and supplies or a trip to an off-site restaurant for a less-expensive meal. Having your own transportation is just easier and more convenient.