I dont understand why this is locked to graphics cards above 1 GB.
I can run udk and dx10 games without problems.
There is a 2D demo in ue4, if someone needs to make a simple 2D game or low poly mobile game he still needs an nvidia gtx 780.
You make an affordable plan and give access to source code while this would cost a lot in the past, but you expect everybody to have the last graphics cards on the market.
If you wont unlock this my last hope is to subscribe to the new unity 5 plan they launched 2 days ago.