No I'd like SP to stay because you need some way of stopping someone picking up a pickaxe/hatchet/rod for the first time and getting the best things from grade 5 straight away. You need some form of progression in there otherwise no one would ever gather from a node that isn't of the highest grade. The levelling system solves this problem well. Point is gathering classes aren't classes you should be rushing out to SP and max out on.
If they fixed the SP on fatigue issue and set a minimum of 120 SP per optimal grade node or whatever so that SPing past 42 didn't suck ass I don't think many would complain about the rate of SP.