It's really hard to get at the 7 month mark. Most people don't realize, there are a grand total of 23 studios and 23 one-bedrooms (as lock-offs) and then 2-bedroom units. Unlike most WDW properties where the 1-bedrooms are often readily available at 7 months, studios and one-bedrooms are almost as equally difficult to get. If you get lucky and the rooms are available at your 7-month window - you can log on right at 8 AM, and hope and prey your computer is faster than all the other 7-month people.
However, if you are patient you can waitlist at 7 months. Talking to a few VGC owners, they tend to book rooms knowing they may or may not be going, but they know the only way to book is to beat the 7 month mark. So VGC owners tend to cancel with short notice more than I think the average WDW person does. We actually got a 1-bedroom for February break in 2016 - but had to wait for the waitlist to come through a mere 33 days before our trip.
My advice would be have a back-up plan. We are thinking of going out next year for D23 - and while we wouldn't stay at VGC during the convention, we would love to stay there a few nights before to enjoy the park. However, I am in serious doubt that we will get anything - so am expecting to stay at our stand-by, the Tropicana Inn and Suites. I may still waitlist and see what we get.