I think this is the central question to a lot of the decisions the Celtics make this summer: Can Isaiah Thomas maintain this level of production (that is, an All NBA level) for the next handful of years or was this year far and away his best season and any new contract will be paying for past performance?
I have a feeling when John Wall and Kyrie Irving are 29, there won't be the same kind of discussions from their fans about whether or not to sign them to max deals. Not because they're better than IT has been this season, but because they have longer track records of playing at that level and there is an assumption that it will continue. This last season, IT had career highs in points, 2P%, 3P%, FT%, and FTA. This coming season will be very interesting to watch.
Maybe it's just me, but my concern is that IT signs a big deal in 2018 and then never reaches the production/efficiency we saw from him this year.