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There is no reason not to, especially if you have disposable income.
People keep saying how "this is a bad game", but they forgot that GF has also noted that this and Gen 8 are two separate things. THIS game is for the sake of opening up the market to GO players, while the yet-to-come Gen 8 is of course for the veteran player. It is simplified for their sake, but not to the point where they lose what makes a mainline Pokemon game; despite the change in wild battle mechanics, there is still the trainer battle after all. This is to get them to realize that "hey, there is more to Pokemon than flicking Pokeball at lil critters".
So yes, bottom line is, GO players should get this for it's a new opportunity for them. Veterans depend, if they want a taste of nostalgia, then pick this up. If not, well, just replay previous games and wait for Gen 8.
I honestly don't know what point I'm trying to make.