Within 50 years of linear emission, the supply inflation will be what fiat is targetting (2%). It will keep lowering after that and behave more like gold.
But maybe that misses the point: I have a firm belief that crypto currencies in one form or another is the future of money. History is too fraught with hyperinflation for it to not happen. The crypto currency that wins, though, will be the one that's in highest demand, not the one that's serves some abstract societal goals. So maybe the relevant question is: would linear emission be more attractive for its holders than e.g. Bitcoin's emission scheme with halvings of the inflation rate every four years?