I don't really like it but from a business prespective it's understandable. If they say that GTAO will constantly grow and evolve for free and R* gives us new content for free I don't mind the whole microtransactions thing.
It shouldn't have an effect on the competitive side anyways since you usually pick your weapons up from the ground in these cases. In regards to free roam the only downfall would be that the stock market could possibly be controlled by people with alot of real world money into the game but as long as that does not mean they get an edge on me in terms of overpowered weapons and vehicles then I'm fine with that. It's just a shortcut after all. Money can't buy skill anyways.