I'm sure crowds will be back in stadiums regardless of TV coverage although I do think we might see a trickle back of fans over the next 1-2 years. TV coverage vs in-stadium is Apples and Pears and whilst both are entertaining the atmosphere of being at a game, seeing people of old and enjoying a few cold ones during the game.
I'm not sure ref-link or bigger screens is really a 'pull' for stadia. If you want the best viewing and real-time analysis or insight, then you'd stick to BT Sport coverage save some cash as by the time we've bundled 6 of us up to Coventry, paid for season tickets, parking, beers, food etc... it'd be a fraction of a cost to watch on BT Sport, or VPN into ESPN/RugbyPass or whatever streaming service is showing the coverage being filmed for the highlights and official replays.
Speaking with friends, family and clients there's a real mixed bag to be out as 'mass-spectator events at the moment and I think the general public are perhaps more wary than the confidence in gyms, restaurants etc being open suggests.