Yeah, in fact I think most systems having dual burns go back a lot longer than just 3 years.
Average Bitrates for 180 minutes of video when using ac3 audio –
DVD-5 3.1 Mbps
DVD-9 5.9 Mbps
The other factor is what is your video of, talking heads on a lockdown camera? sports? how good is your video? shoots well light? low amount of noise? All this makes a huge difference as to how well it will look. But going DVD-9 (Dual Layer) would always be the first choice. BTW If your burner is not DL it would also be dog slow, you can upgrade for under $100.