I haven't been to speedway for a few years now, largely since Wimbledon closed. I'd prefer the old tac. sub rule but I can see the thinking behind the tactical ride, though I can see why it would puzzle newcomers because it is so unlike other sports, many of whom have substitute rules. Scoring systems are complicated in a lot of sports (bonus points in cricket and rugby, away goals in football) so why are these things not issues in those sports (perhaps they are, but I'm not aware of it). I suspect the difference is that speedway is perceived to be in crisis where the other sports aren't and so its fans are casting round for a solution and these seem to be obvious targets. Personally, my nearest track is Rye House and I don't go because it's a long trek by public transport for some not very good racing the last few times I was there. The racing there used to be good in the days of Ronnie Russell and I went regularly. So, my suggestions are, well-prepared tracks, evenly matched riders and speedway can still be immensely attractive.