Speaking strictly from a financial perspective, given the extreme cost of buying at VGC, you would be better off renting points for the next 15-20 years vs. purchasing. However, if you place value on things such as being able to control your reservation and having a little more flexibility then yes, buying DVC might work for you. As for Floriday trips, using VGC points to book at WDW properties is like booking an Uber XL just for yourself. You're paying a lot more than you need to in order to accomplish the same goal.
The only issue with renting VGC points is the small number of owners renting out their points vs. those that are looking to rent. It is one of the more popular rental requests through the 2 biggest brokers and very popular on the rental boards. So I think the point I bolded above is actually extremely important when considering buying VGC to stay at VGC. Because that value on control of your reservation is very important when the wait lists at the brokers are very deep (and it's not a first come first serve system) and your reservation is never picked to be fulfilled before availability disappears (especially if one wants to travel over weekends). The DISBoards work but the VGC points disappear/rent super quick and usually above 18 a point.
As for cost I found that buying VGC for short 3-4 night trips is well worth it, if you plan on staying on-site, which in my case was what I was only interested in (not interested in the Harbor or Katella hotels, wanted a more resort feel, i.e. GCH). As for the rental prices, I could see them climbing higher for VGC and the more in-demand WDW resorts (e.g. VGF) simply because the demand is there and a huge savings over the respective cash side at each resort, which should bump them up quite a bit in value, IMO. Just a quick analysis for 2/14-2/17/2020 at VGC it would be 61 points or about 1,098 inclusive of Parking and Taxes (if you go through a broker). That means about $366 a night for the studio. Below are some cost estimates for other Resorts:
DLH: 2,060.37 - You would then need to add in the $25 per night for parking if you had a car
PPH: 1,495.26 - You would then need to add in the $25 per night for parking if you had a car
GCH: 2,523.69 (Standard View) to 3,050.19 (Premium View) - You would then need to add in the $25 per night for parking if you had a car
Best Western on Harbor: $650 (does include a continental breakfast) - I chose this resort for it's close/walk-able proximity and being the median price of the walking distance resorts.
So you are talking about renting VGC is about 70% more expensive than the Harbor hotels. Compared to on-site VGC is a 36%, 50%, and 130% savings on the cheapest rooms at PPH, DLH, and GCH respectively. So if the other option for the OP is to stay on-site they may find significant value in VGC resale, especially if they are staying DLH or GCH.