There's been talk for ages about flexible season tickets on smartcards, but as yet nothing has happened. I think the idea was for GTR to trial such a scheme to get rid of paper based carnets, but nothing came of it.
I hope in due course it does, along with all the other improvements that are supposed to come (KeyGo and being able to just buy single/return tickets to store on your card).
I was having a conversation with some people recently about the possibility of having an off-peak between midnight and 4, 5 or 6am (that bit wasn't decided) to encourage staggered working where people might opt to travel before the morning peak.