Speaking as someone who already watches all City league games via RobinsTV at what works out for under £4 per game, it will be interesting to see what the charge for the DAZN service will be and whether that will mean an end to RobinsTV, IPTV etc.
Costs are ultimately what deter most fans from actually attending and opting to watch on TV. As several have mentioned this might result in clubs having to lower admission prices to avoid a fall in attendances. For me, taking into account fuel and parking charges, a full price admission matchday means forking out about £50. These days I only go down to discounted entry price cup games, not shown on streams. For me, and mates doing the same, only if we were really pushing for promotion would we be prepared to start paying our £50 a time to attend league games to soak up the atmosphere.
Overall I think attendances would take a modest hit, say 10% drop, unless clubs lower prices, as this service will have a wider audience than RobinsTV and the like.