I'd be happy to pay a fiver to watch a Wasps game that I couldn't attend or wasn't on BT Sport (starting tomorrow). The full match being available on the Prem Rugby site a few hours later is all very well, but I rarely get the time to watch it as I don't set the time aside as I do when watching live. The full weekend pass certainly isn't for me. On any weekend you'll have 3 live games on BT anyway, and any other games will at least partially clash with those. Probably only end up costing me £20-£30 extra a season.
Imagine the coverage will be similar to the red button coverage of all games while they were being played behind closed doors.