If we’re going to get a full years preparation they might as well switch to DVB-T2 as well. Can be sold to viewers as one big switchover (can probably even be nationwide instead of region-by-region like the digital switchover), much easier to understand even if their TVs are completely fine and they don’t need to upgrade. If the networks are able to knuckle down and make a switchover happen without needing the government then they absolutely should. It shouldn’t be too hard of a change, most Australians should remember the digital switchover.
In any case, running a test channel loop would be one way to help viewers understand the switchover as well. Ad campaigns can include something along the lines of:
If you can see and hear the test channel on Channel [x] with no issues then you’re good to go, there’s no need to change your TV. If you can’t see or hear the test channel, you’ll need to buy a set top box or upgrade your TV.